I guess in every team you'll find the Mulligan's or the Diego's. It's just part of the professional set-up of football clubs. You just can't have 14-15 players for a while season and you need to have more. Unfortunately some end up sitting in the stands and not getting any game time.
happens worldwide, however the classy team players, stay true to the coach and team, the train ahrd and support the team through everyhting, not moan about how the coach doesn't like them,