If a player gets injured after the manager has used all available substitutions, the team usually has to keep playing with one fewer player unless the injured player can continue. In most football rules, there is no extra replacement just because of injury once all subs are gone.

A few important points:

  • The injured player can stay on if they are still able to play, even if only partially.
  • If they cannot continue, the team plays short-handed for the rest of the match.
  • In some competitions, there are special laws for head injuries or concussion substitutes, but those are competition-specific and not a free extra sub in every case.

One wrinkle from recent law changes is that if a substitute is delayed too long when coming on, the team may temporarily be reduced to 10 players. That is separate from an injury, but it shows how substitution rules can affect team numbers during a match.

In practice

So the simple answer is: the team usually cannot replace the injured player once all substitutions are used, and they may have to finish with 10 or fewer players if the injury is serious enough to force that player off.

TL;DR: no subs left means no normal replacement; the team either keeps the injured player on or plays a man down.