Football substitution rules: five subs, three windows

Two boards go up at once on the touchline in the sixty-fourth minute, three shirts come off, and a manager who has been pacing since the interval empties a third of his bench into the game in one movement. That single gesture is the whole of modern football substitution rules in miniature: five players may go on, but only at three moments, and a coach who spends a moment carelessly has fewer of them than the man in the opposite technical area. The count everybody quotes is the number of substitutes. The number that actually shapes matches is the number of chances to use them.

The headline figures first, because they are what most people arrive looking for. In top-level official competitions, Law 3 of the IFAB Laws of the Game permits each team a maximum of five substitutes, to be used within a maximum of three substitution opportunities, and changes made at half-time do not consume one of those opportunities. Up to fifteen substitutes may be named on the team sheet at the competition organiser's discretion. Where extra time is played, unused substitutes and unused opportunities carry over, and competitions may grant one further opportunity. Everything below the top level is set by the competition within the framework Law 3 provides, which is why the answer to "how many subs?" genuinely does depend on which match you are watching.

• 5Substitutes usable in a match
• 3Substitution opportunities, excluding half-time
• 15Substitutes that may be named on the team sheet
• 1Additional permanent concussion substitutes per team

Ceilings set by the Laws of the Game for top-level official competitions. Individual competitions may permit fewer.

The five-substitute rule and how it stopped being temporary

The current numbers arrived through an emergency and stayed through an argument.

In May 2020, with competitions restarting after suspension into compressed calendars and with squads that had not trained normally for months, the IFAB introduced a temporary option allowing up to five substitutes. The reasoning was purely about player welfare under fixture congestion, and the measure was expected to lapse. It did not. Competitions extended it, then extended it again, and by the time the IFAB met at its 136th Annual General Meeting in Doha in June 2022 the option had been in continuous use for two seasons across most of the elite game.

That meeting made it permanent, effective from 1 July 2022, and at the same time raised the ceiling on named substitutes from twelve to fifteen at the competition organiser's discretion. The restriction to three substitution opportunities plus half-time was confirmed rather than relaxed, which is the part of the decision that tells you what the IFAB was actually worried about.

The objection that had to be answered was competitive rather than medical. Five substitutes was said to favour clubs with deep, expensive squads, because a side able to bring on five internationals changes a match in a way that a side bringing on five academy graduates cannot. That criticism has never gone away and it is not obviously wrong. What the IFAB weighed against it was a workload problem that had grown steadily worse: more competitions, more matches, less recovery, and a body of medical evidence about the injury cost of accumulated minutes that no governing body was comfortable ignoring.

How the game got from no replacements at all to five

The modern bench is a recent invention, and the direction of travel over a century has been consistently in one direction.

For most of football's first hundred years the Laws made no provision for replacing a player at all. A team that lost someone to injury played on short, and the consequences were accepted as part of the sport in a way that looks extraordinary now. Cup finals were decided by injuries to players who limped on the wing for an hour because leaving would have reduced their side to ten. The argument against substitutes was the one always made against any relaxation: that a squad game is not the same game, and that eleven against eleven means the eleven who started.

The first breach was medical. Competitions began permitting a replacement for a player who could not continue through injury, which is the narrowest possible version of the idea and the hardest to argue against. It also proved impossible to police, because whether a player is genuinely unable to continue is a judgement no referee can make, and feigned injury became the obvious route to a tactical change.

So the Laws did what they usually do when a rule cannot be enforced honestly: they removed the condition. Substitutions for any reason followed, first one, then two, then three with the third often restricted to a goalkeeper before that restriction disappeared as well. Three became the settled number for a long stretch, long enough that a generation of supporters thinks of it as the natural figure. The move to five in 2020 was larger in scale but identical in kind, and the reasoning was the same one that had driven every earlier step: the bodies of the players and the demands of the calendar had moved, and the Law moved after them.

What has never expanded at the same rate is the number of stoppages. That asymmetry, more players and the same three moments, is the shape of every substitution rule the sport has adopted since it started counting windows.

Why the three-opportunity limit is the rule that actually bites

If the Laws allowed five substitutes at any five stoppages, the game would look different, and not in a way anybody wanted.

Each substitution costs playing time. The ball goes dead, a board goes up, one player walks off and another walks on, and a stoppage that might have lasted eight seconds lasts forty. Five of those per team is ten interruptions in a match, distributed by two coaches whose incentives include stopping the game at inconvenient moments for the opposition. The opportunity limit exists to cap that. Three stoppages per team, plus a free interval at half-time, keeps the cost of the change bounded no matter how many players move.

It also creates the tactical texture that makes substitutions interesting to watch. A coach holding two players ready has to decide whether to send both on now, spending one opportunity, or to send one on and keep the other in reserve at the price of a second window. Sending on a defender at the seventy-fifth minute to protect a lead is cheap if you have windows to spare and expensive if it is your last. Managers who make an early forced change through injury, then a double change on the hour, arrive at the eighty-fifth minute with a single window and a bench full of players they can no longer use separately.

The accounting is simple once stated. An opportunity is a stoppage, not a player. Three players at one stoppage costs one. One player at three separate stoppages costs three. Half-time is free.

There is one more wrinkle worth knowing. A team that makes a change at a stoppage while the opposition is also making one does not share the opportunity; each side is charged for its own. And a side that has used all three windows in normal time cannot recover one by declining to use its remaining substitutes, because the opportunity is spent when it is taken.

1. 1The referee is informedA substitution may only be made once the referee has been told, normally through the fourth official at the touchline. Nothing else may happen until that has been done.
2. 2Play must be stoppedSubstitutions happen during a stoppage in play. The Laws do not require any particular kind of stoppage, so a throw-in, a goal kick or an injury break all serve.
3. 3The board or the signal is givenThe substitution board displays the numbers, or where no board is used the referee signals directly. This is the moment the ten-second clock starts.
4. 4The player leaves within ten secondsThe player being replaced must be off the field within ten seconds, normally at the nearest point on the boundary line. Missing it delays the substitute until the first stoppage after a minute of running time following the restart.
5. 5The substitute waits at the halfway lineThe replacement enters at the halfway line, not at the point where the departing player left, and only after receiving the referee's signal.
6. 6The substitution is complete on entryFrom the moment the substitute enters, they are a player and the replaced player is a substituted player. Responsibility for anything that follows sits with the player on the pitch.
7. 7The opportunity is recordedIf further changes are made at the same stoppage they cost nothing extra. The next stoppage at which the team makes a change consumes another of its three opportunities.

The sequence Law 3 sets out, including the ten-second exit requirement introduced for 2026/27.

The procedure, and what happens when it is not followed

Law 3 is unusually procedural for a Law that governs so few incidents, and the reason is that almost every substitution problem is a problem of sequence rather than of substance.

The referee must be informed before the change is made. The player leaving normally does so at the nearest point on the boundary line rather than walking to the halfway line, a detail introduced years ago precisely to stop the long diagonal stroll. From 2026/27 they must be off the field within ten seconds of the board being shown, or of the referee's signal where no board is used, and the penalty for exceeding it falls on the team rather than on the individual: the substitute is not permitted to enter until the first stoppage after a minute of running time has elapsed following the restart. A side that tries to burn seconds plays them a man light.

The substitute enters at the halfway line, during a stoppage, and only when the referee signals. All three conditions matter. A substitute who steps on before the signal, or from the wrong place, or while the ball is in play, has entered without permission.

The consequences of getting it wrong are set out plainly. A substitute who enters without permission is cautioned, play is stopped, and the restart is an indirect free kick from where the ball was when play was halted. That restart location is a deliberate choice: it neither rewards nor unduly punishes the offending side, because the offence is administrative. Where a team attempts to use more substitutes than it is permitted, the excess player is removed and the match restarts appropriately, and where a named substitute is sent off before or after kick-off, that player may not be replaced. A team's bench can be reduced by discipline in the same way its eleven can.

Sitting underneath all of it is the floor that makes a match a match. A game may not start or continue if either side has fewer than seven players, temporary dismissals aside, and from 2026/27 the Laws state that a team responsible for an abandonment because it has dropped below seven will in principle forfeit.

How many substitutes different kinds of match allow

The five-and-three figure is a top-level rule, and repeating it everywhere causes half the confusion in this subject. Law 3 sets out several different regimes.

Top-level official competitions, meaning the highest domestic divisions and the senior competitions of FIFA, the confederations and the national associations, may permit up to five substitutes within three opportunities. That is a ceiling rather than a mandate, and a competition can and sometimes does set a lower figure.

Senior international matches outside those official competitions, which in practice means friendlies, have their own line, and it moved for 2026/27. Up to fifteen substitutes may be named, and the number that may be used rose to eight, or to eleven where both teams agree and inform the referee before kick-off. The three-opportunity restriction still applies, which is the point: a manager may replace an entire team across three stoppages, but may not stop the match eleven times to do it. The change recognises what friendlies are actually for, which is looking at players and managing minutes in a calendar that leaves little room for either.

All other matches sit under a permissive default. A greater number of substitutes may be used provided the teams agree a maximum and the referee is informed beforehand; where there is no agreement, or the referee is not told, each team is limited to six. Youth, veterans, disability and grassroots football may also permit return substitutions, where a player who has been replaced can come back on later, subject to the approval of the national association. That single provision does more for participation than anything else in Law 3, because it turns a squad of eighteen at an under-elevens match into eighteen players who all get a game.

Top-level official competitions5

Other matches, default where no agreement is made6

Senior international friendlies8

Senior international friendlies, by prior agreement11

Ceilings under the Laws of the Game for 2026/27. Competitions may set lower figures, and the three-opportunity restriction applies throughout.

Show the numbers

Maximum substitutes usable, by type of match

Item	Substitutes
Top-level official competitions	5
Other matches, default where no agreement is made	6
Senior international friendlies	8
Senior international friendlies, by prior agreement	11

Substitutes in extra time, and what carries over

Where a tie goes beyond ninety minutes, the accounting continues rather than restarting, and the distinction catches people out.

Substitutes a team has not used, and opportunities it has not spent, carry into extra time. A side that has made two changes at two stoppages arrives with three substitutes and one opportunity still in hand. On top of that, where the competition rules provide for it, each team receives one additional substitution opportunity in extra time, and many competitions also permit an additional substitute. The number of players and the number of windows are separate allowances and a competition may grant either without the other.

The practical effect is that the bench becomes a live tactical asset again at the end of a match where it had been nearly exhausted, which is why sides that reach the additional period often look fresher than the preceding twenty minutes suggested. What extra time itself involves, and how the period is structured, is a separate subject with its own rules.

Concussion substitutes: a separate allowance for a separate problem

The most significant recent addition to Law 3 does not sit inside the five at all.

Following approval at the IFAB's 138th Annual General Meeting in March 2024, competitions may permit additional permanent concussion substitutions. Where a competition has adopted the protocol, each team may make one such substitution per match for a player with an actual or suspected concussion, and it is genuinely additional: it may be made regardless of how many substitutes the team has already used, and it sits outside the limit on normal substitution opportunities. The player who comes off takes no further part in the match, which is the entire point of a permanent rather than a temporary mechanism.

Two features of the design deserve attention. The first is that the opposing team is informed by the referee or fourth official that it may use an additional substitute of its own. Without that, a concussion substitution would hand a competitive advantage to the side unlucky enough to have a head injury, and any advantage attached to a head injury is an incentive nobody wants to create.

The second is that match officials do not decide whether an injury is a concussion. That determination belongs to the team's medical staff, with the coach, and the referee's role is to administer the substitution and to report afterwards if the protocol appears to have been misused. Referees are not physicians and the Laws do not pretend otherwise.

The argument that continues is about whether permanent substitution is the right instrument. A permanent change forces an immediate, irreversible decision at the moment when the medical picture is least clear, which some clinicians say encourages medical staff to wait rather than to act. A temporary substitution, allowing a proper off-field assessment with the option of returning the player, is used in other sports and has been pressed on the IFAB by a long list of competitions. Rugby union's approach to the same problem, described in the head injury assessment protocol, is the comparison most often made. The counter-argument is that a temporary mechanism creates its own abuse route and that permanence is what makes a removal stick.

Swapping the goalkeeper, the change that is not a substitution

One movement that looks like a substitution is not one, and the Laws deal with it separately.

Any of the players on the field may change places with the goalkeeper, provided the referee is informed before the change is made and the change happens during a stoppage in play. No substitute is used, no opportunity is spent, and nobody leaves the field. An outfield player pulls on the goalkeeper's jersey and gloves and becomes the goalkeeper for the purposes of every Law that treats goalkeepers differently.

This matters in two situations. The first is a goalkeeper sent off after a team has used all its substitutes or all its opportunities, where an outfield player has to go in goal and the side finishes with ten. The second is the goalkeeper injured beyond continuing in the same circumstances. Neither is common, but both are the reason the provision exists, and a coach who has spent every window by the seventieth minute is one incident away from needing it.

The procedural requirement is the whole of the rule. Change without telling the referee, and the Laws direct the referee to allow play to continue and to caution both players involved at the next stoppage. As with unauthorised entry by a substitute, the offence is the failure to inform rather than the swap itself.

Who is allowed on the bench, and what happens when a team runs out

Substitutes are not simply the players who turn up. They are the players named on the team sheet before kick-off, and a player not named cannot be used, however obviously available they are and however many places on the bench are empty. That is why a late fitness test failure sometimes leaves a side with fewer options than the ceiling allows: the list closes when the sheet is handed in.

Named substitutes are also under the referee's authority from the moment the sheet is submitted, which is why a substitute can be cautioned or sent off without ever entering the field, and why a named substitute dismissed before or after kick-off may not be replaced by another player. A bench is a finite resource that can shrink through discipline as well as through use.

Running out is a real state and it has consequences the Laws simply accept. A side that has spent its three opportunities and then loses a player to injury plays on with ten. A side that has used all five substitutes and loses another player does the same. There is no emergency provision, no exception for an injury sustained in the final minutes and no mechanism for a competition to grant one mid-match. The only floor is numerical: a match cannot begin or continue with fewer than seven players on either side, temporary dismissals excepted, and the 2026/27 text adds that a team responsible for reaching that point will in principle forfeit the match.

This is the reason cautious coaches hold a window back. The value of an unspent opportunity is not the change you have planned, it is the change you have not yet had forced on you, and a bench with three players and no windows is worth nothing at all.

What five substitutes did to the way teams play

The rule change did not simply give coaches more players. It changed what a squad is for.

The clearest effect is on pressing. A high-intensity pressing structure is expensive to run for ninety minutes and degrades sharply as legs go, which is why sides that press well have historically dropped off after the hour. With five changes available, a team can refresh its front line wholesale and keep the intensity of the press near its starting level into the final twenty minutes, which alters the shape of matches that used to open up late. Our explainer on pressing as an organised system sets out why the physical cost is the binding constraint on that style, and five substitutes loosen it considerably.

The mirror image applies to defensive sides. A team holding a lead can now bring on fresh defenders and midfielders to maintain the compactness of a deep defensive block, where previously that block frayed as concentration and legs failed together. The tactics of defending in a low block rely on players holding precise positions for long periods, and precision is the first thing fatigue takes.

The third effect is on the game state itself. Late goals are disproportionately scored by fresh players against tired ones, and increasing the supply of fresh players on both sides has made the closing period of matches more volatile rather than less. That interacts directly with the longer added periods the sport now plays: more minutes at the end, played by more players who have not been on the pitch all afternoon.

The squad-building consequence, and why it costs money

A rule about substitutions is also a rule about recruitment, and this is where the competitive objection has its teeth.

Under three substitutes, a squad needed roughly a strong eleven plus four or five players good enough to enter a tight match. Under five, it needs a strong eleven plus a group of players who are close to the standard of the starters and who will accept a role that is mostly not starting. Those two things are in tension, because a player good enough to change a match is usually good enough to be wanted as a starter somewhere else, and persuading them to stay costs wages.

That pushes clubs towards larger, more expensive squads, and it makes the summer and winter trading periods more consequential than they already were. The mechanics of that market, and the windows within which it operates, are covered in how the transfer window works. It also increases the value of loan systems and academies, because the cheapest way to fill a bench with usable players is to develop them.

The counterweight is that a bench is only worth what a coach dares to use. Managers vary enormously in how readily they make changes, and there are coaches at the top level who routinely finish matches with substitutes unused and windows unspent. The Laws set a ceiling. They cannot make anybody reach it.

42%58%

• Starting eleven11
• Named substitutes, maximum15

The starting eleven plus the maximum number of named substitutes a competition organiser may allow.

Show the numbers

A matchday squad at the ceilings the Laws permit

Item	Value
Starting eleven	11
Named substitutes, maximum	15

What to watch for on the touchline

Once you are counting opportunities rather than players, the technical area becomes much easier to read.

Watch which changes get bundled. A coach who is thinking about windows will hold a planned change until another one becomes necessary, so a double substitution on the hour is often two separate decisions economically combined. A coach who makes single changes at the fifty-fifth, sixty-fifth and seventy-fifth minutes has spent everything and has no in-play flexibility left for the last quarter of an hour, which is exactly when it is worth most.

Watch the forced changes. An injury inside the first half hour is expensive twice over, once for the player and once for the window, and a side that suffers two of them is effectively down to a single remaining opportunity before the game has properly settled. That is one of the quiet reasons early injuries hurt teams more than the replacement's quality suggests.

Watch the exit route. Since 2026/27 the ten-second requirement means a substituted player heading for the nearest touchline rather than the halfway line is not being petulant, they are complying, and a player who lingers is costing his own side a minute with ten men.

And watch the fourth official when a head injury occurs. If the concussion protocol is being invoked, the sequence is visibly different: the substitution goes ahead outside the normal count, and the opposing bench is informed that it may respond with a substitute of its own. Two changes that appear to come from nowhere at the same stoppage are usually that protocol working as designed.

More on the rules, tactics and economics of the game sits in our football section, and the rest of our explainers across every sport are collected in the blog.