4) Mesut Ozil
Granted, injuries have played their part, but Ozil has nowhere near lived up to his mammoth £42m price tag so far this season. The German playmaker started brightly, assisting eight Premier League goals in the first half of the season, but started playing badly around Christmas time. His defensive work-rate is poor, so when he isn’t contributing in the final third, he becomes a liability the rest of the side has to carry. With his exceptional talent though, he more than has the capability of proving his worth at some point.