Well, i meant injured while training.
You are talking about injured while playing.

I read just minutes ago that a player with lower mentality then his offence/defense may have injuries
If he is a defense player he should have close or higher mentality compare to his defense skills.
If he is an attacker he should have close or higher mentality compare to his attacking skillss.
See if it works for you and let me know, i need it as well.