The beginning of the Season (maybe because more matches with Cup, League & CL for some) seem to be more injury prone (I tend to get a rash at the end of the Season too), certainly you are not alone in getting a bunch of injuries, Sherifon.
Try to sell some of the less useful or older guys. If a player, no matter how good, gets injured repeatedly (and I've skewed his attributes to no avail) I sell them. Try to rotate out players, and have good bench player backups for key players.
I will say for the umpteenth time I truly believe players with higher physical stats seem to get injured less.