Substitutions are a part of your tactic, and provide you with lots of ways to determine what happens during the game.
Substitution rules give you the ability to precisely pick which players should sent sent in our out at exact times during the game.
Automatic substitutions will help you if one of your players is unable to play a game, either due to injuries or suspensions.
Sold or retired players can be temporarily substituted by your reserves.
See the sub-sections for explanations of how each kind of substitution works.