Previous poster was spot on, if a player is injured and play has not restarted, then sub can come on, but an injured player who can continue must leave and return after the restart, if both these things happen at the same time its unusual, but what happened last night was correct
The one I am waiting for is when there is a 3 player collision, 2 from one team, and one from the other. In that situation, if all 3 after treatment are able to continue, then the team who had 2 players injured are allowed to leave their players on the park, but the team with only one player injured has to remove their player till after the game has restarted. I wont go into the technicalities, but just believe me, thats the rules as from the start of this season. Cant wait to see the reaction of the manager who has to remove his player, and I can only hope and pray its Lennon, just wait for the cardiac arrest to hit !!