the main reason for a substitution (besides injury) is when a players condition gets below 70.except for when he gets a hit and his condition drops but without a green cross.in most of these cases i let him play.
also when i'm losing by 1 goals i put a 3rd ST about after the 80th minute.of course when a player has a bad game (5 or 6(when others have a 7) ) he gets subed out. | 
