An injury crisis for me is extremely rare. I think since FM05 or FM06 people have constantly been complaining about too many injuries, yet it has never affected me. I generally have so few injuries in fact, that I would say there simply arent enough, but Im not gonna complain of course
I just finished the first season with Chelsea btw, and Arjen Robben played 59 matches, of which 37 in the league. Only at the end did het get an injury for a week or so. Although Robben usually does get injured more for me, it is very telling that this time he simple didnt.
Other then that, I just have very fit players and the best physios in the game. Only once in a big while do I have several players injured at the same time. Most of the time, there's simple noone injured.