#4 Mathieu Debuchy
After a successful spell at Newcastle United, the French defender joined Arsenal in July 2014 for a fee of around £12 million, although, his time at the Emirates has been nothing short of a disaster.
Since the beginning of the 2014-15 campaign, Debuchy has only made 13 appearances in the Premier League; 10 of those coming in his first season. He has spent the last two seasons playing second fiddle to Hector Bellerin, and has failed to cement himself a place in Wenger's starting XI.
The fact that he is 32-years-old means that he will most likely to not feature for his national team again, but that doesn't mean he cannot end his club career on a high. Staying at the Emirates will make that an impossible task, so Debuchy should most certainly look for a move away as soon as he can.