probably happened cos of the international games in between, has happened to me before around that stage on other verions of FM, its not new, if u see liverpool will have the same thing happen to their squad too
Its the game mate. Theres a problem with the club fixtures and international fixtures clashing a lot in the game and its addressed in the patch by SI. You'll just have to lump it for the time being and play the best team you can possibly put out. That is a lot of players out though sadly. Tough one dude.