Football Substitution Rules Explained

Most people know the answer is five. Far fewer know about the three windows, which is the rule that actually shapes how managers use them.

Five substitutions, three windows

A team may make five substitutions, but only across three separate stoppages.

A window is one break in play in which a team makes changes. Bringing on three players at once uses a single window. Bringing on three players at three different moments uses all three, and the team has none left however many substitutions remain unused.

That constraint is why you see managers hold a change for ten minutes rather than making it immediately. Making a lone substitution on 60 minutes spends a window on one player. Waiting until 65 and making two spends the same window on two.

There is one important exemption: half-time does not count. Play is already stopped, so a manager can change three players at the interval and still have all three windows for the second half. Managers exploit this heavily, and it is why so many changes arrive at the break rather than in the 50th minute.

Where the five-sub rule came from

Three substitutions was the standard for decades. Five arrived in 2020 as a temporary measure, introduced when the pandemic forced compressed fixture schedules and player workload became a safety question.

It was supposed to be short-lived. It became permanent, because the calendar never went back to normal and player unions supported keeping it. The three-window limit was attached deliberately at the start, since regulators could see that five unrestricted changes would hand any team protecting a lead a very effective way to waste time.

The change was not universally popular. The main objection is competitive rather than medical: five substitutes favour clubs with deep, expensive squads, because a team with five good options can refresh in a way a team with five teenagers cannot.

Concussion substitutes are separate

A concussion substitute sits outside the normal system entirely.

Each team gets one additional substitution for a player with a confirmed or suspected concussion. It does not count against the five, and it does not use one of the three windows.

The protocol also gives the opposing team an extra substitution of its own when one is used. This exists to remove any competitive incentive around the decision. Without it, a team could gain an advantage from an opponent's head injury, and medical staff would be under pressure they should never be under.

The principle behind the whole protocol is that the decision to remove a player must never involve weighing a tactical cost. If a doctor suspects concussion, the player comes off, and the team is no worse off for it.

Extra time adds one more

If a knockout match goes to extra time, each team gets one further substitution and one further window.

This is worth planning for. A manager who has used all five changes and all three windows by the 85th minute still has one available if the match goes on, which occasionally explains a side declining to make an obvious change late in normal time. Our guide to extra time and penalty shootouts covers the rest of what changes.

One consequence people miss: a substituted player cannot take part in a penalty shootout. Only players on the pitch at the final whistle are eligible. A manager weighing a substitution in the 118th minute is also choosing who will and will not be available to take a kick.

The mechanics

The player leaves first. The substitute does not enter until the player being replaced is off the field. Entering early is a cautionable offence.

Leaving at the nearest point. A player being substituted should leave by the closest boundary line, not walk the length of the pitch to the halfway line. This was tightened specifically to stop players burning thirty seconds on a slow diagonal stroll, and a referee can caution someone who ignores it.

Only at a stoppage, with permission. Substitutions happen when play has stopped and the referee has signalled.

No coming back. Once replaced, a player takes no further part in professional football. Rolling substitutions, where players go off and return, exist in grassroots, youth and some futsal-derived formats, but not at senior level.

Bench size varies

The Laws of the Game do not fix how many substitutes a team may name. That is set by each competition, and it ranges roughly from seven to twelve depending on the tournament.

This produces a small oddity: a league can allow nine on the bench while permitting only five to be used. The extra names are cover for injuries in the warm-up and for the goalkeeper nobody expects to need.

What it changed about the game

Five substitutions altered late-game football more than the number suggests.

Teams press harder for longer, because fresh legs are always coming. Squad depth became more valuable relative to a strong first eleven, which advantages wealthier clubs. And the last twenty minutes of matches now feature more running, not less, which is part of why late goals have become more common alongside the growth in stoppage time.

Whether that is an improvement depends on what you want from the closing stages. It is certainly a different game from the one where a tiring side simply had to hold on.

The short version

• Five substitutions, across three windows.
• Half-time changes do not use a window.
• Concussion substitute: one extra per team, outside the five and the windows, with a matching extra for the opposition.
• Extra time: one more substitution and one more window.
• Substituted players cannot return, including for a shootout.
• Bench size is set by the competition, not the Laws.