#8: Mathieu Debuchy
Frenchman Mathieu Debuchy shook hands with Arsene Wenger after making a name at Newcastle United. Arsenal signed the right-back for £12 million in July 2014.
Still biding his time at the Emirates, Debuchy looks nowhere near the form that convinced Wenger to sign him three years ago. The French left-back has already fallen behind Hector Bellerin as the first-choice right back at the Emirates.
Debuchy has also claimed that he doesn't get on quite well with his boss after Wenger blocked his move to rivals Manchester United. To top the pile, the Arsenal manager still seems to keep Debuchy unused even after blocking his move to rivals.
Wenger sent Debuchy on loan to Bordeaux last year and the Frenchman is keen on moving out due to lack of game time. Arsene is surely being unjust with the Frenchman, not letting him move and keeping him unused at the Emirates.