I was wondering if somebody did research about injured players during the game. I mean, what happens if you don't switch an injured player during a match. Last time my goalkeeper was injured during a match and I had no options to switch him for another goalkeeper, so I let him finish the entire match. I didn't notice any weaknesses and he had a good rating after all. So actually my question: is there a good reason to switch a injured player during a match (or is this cosmetic) ?