There is no way you can avoid injuries. There are only ways to lower the chance of a player to get injured. But this is subject for discussion too. This season i bought an MR With 34 def 45 att and 54 phys/ment. Guess what. 5 days after he gets injured for 6 days. I cure him cause I had an important cup match. 2matches after he got inhured again for 3days... Some ppl say that curing a player severely increases the chances to get more injuries in order to eventually make you use all your cures and then force you to buy more using tokens. So to minimize injuries, refrain from curing them!