you are got unlucky same me the last season.i suggest you dont train them if the condition not above 90%. and dont train above normal.
and dont train with the -9% . some guys say it is the system. so you must be careful in this season.not train alot.and when you train,only train them with the low condition -3%...and make sure the player above 90% conditon befor the game start.
This is my idea,because i was same you in the last season. maybe you will going got more injury in the matches on future.so u much be careful dont train alot. and Tip ( also be careful the tackling stype . when you get more injury,let set it easy style. )
Good luck : )