Honestly idk i havnt played the game that long. But i have a 18 man squad and at one time, i had 7 injuries. That meant no subs, just my first team. Most of those injuries where 5 days. ( This was half way threw the season when buying a player isnt worth it for me since i made my squad at start of the season to a point where i thought id be able to compete for 1-2 trophies ) Eventually all healed and it was great. Then i started getting more injuries so had to bring in replacements, who got injured in the first training they did or game they played. Which left me without certain things. I had to eventually sell some players to bring in older less talented players purely to cover. And yet i still find myself short. My DR was out for 15 days with a broken leg he suffered. Then lost all 3 of my MC's. I dont think the injuries are too often, i just think they always seem to happen where you are weakest.