I spend over 120 red packs this season already on injuries. Healed 2 the normal way and have 1 injured left right now. Last season almost 0 injuries. I think I had 4 or so over the whole season. The thing is that if the injuries start to follow up rapidly you are going to get hit by the injury storm. Had 3 seasons already where I was completely out of red packs and had 1 point where I couldn't play a normal formation (4 mc injured and no way to heal).