What happens when a football team gets a red card?

Picture a defender hauling down an attacker who's clean through on goal, or two players squaring up after a late challenge. The referee reaches into a pocket, pulls out a red card, and points to the tunnel. The player walks off alone, head down, and does not come back, not that half, not after a water break, not ever that game.

That's the whole of it in one line: the sent-off player leaves the field immediately, takes no further part in the match, and his team cannot bring on a substitute to replace him. Ten men finish the match. Eleven become ten and stay ten, however much time is left on the clock.

The Laws of the Game spell this out with no room for interpretation. Law 12 states that a player sent off takes no further part in the match and cannot be replaced. Two separate penalties are stacked on top of each other there, the player is gone, and the team gets no like-for-like swap to cover the gap. A manager down a man cannot shuffle the bench to patch things up with a fresh body; he can only rearrange the ten players already out there.

Red cards come from a short list of serious offences: violent conduct, serious foul play, a deliberate handball that stops a goal, or bringing down a player clean through on goal. Take a defender hauling down the last man as he races through on goal: the referee awards a free kick, shows red for denying an obvious goal-scoring opportunity or serious foul play, and the sending-off sits alongside the restart rather than replacing it. The punishment is never just personal to the player, it reshapes the match for everyone left on the pitch.

There's a second route to the same outcome that has nothing to do with violence or professional fouls at all: two yellow cards in the same game. Pick up a second caution and the referee shows yellow then immediately follows it with red. The offence that triggers the second yellow might be a fairly ordinary foul, nothing like violent conduct, but the outcome is identical. Off he goes, no replacement, ten men for the rest of the match.

The exception most people don't think to ask about is what happens to the team shape itself. Nothing in the Laws forces the manager to remove a specific player or reorganise in any set way, the team simply continues with whoever is left on the pitch, and it falls to the manager to decide how to rebalance formation and tactics with one fewer body. A striker might be sacrificed to add a defender, or a team might simply shut up shop and defend with what it has. The one thing that can never happen is reinforcement: the bench stays shut to anyone replacing the player who was sent off, no matter how much of the match remains.