[boomboomsubban]

The rules specify that the EBUG needs to be available for playoff games, though it does also say that if both goalies are injured any member of the player roster can dress as a goalie. And in the playoffs the roster limit becomes 50, so it's unlikely to come up unless all the other goalies under contract are also deep in the playoffs.

Waiting in the locker room is key though, you can only break the 20 players dressed rule if both goalies are injured.