I would say all injury prone players period. Its only a matter of time before the injuries come. It doesn't even have to be serious injures. Couple of days here and there, couple of weeks. You can't get any consistency because they return lacking match fitness, you have to introduce them slowly meaning couple minutes here and there = bad ratings = not developing ideally. Its just a frustration. Only player I have a a little luck with is Jesus Vallejo, probably because of his professional personalty.