Mathieu Debuchy
This is an obvious one.
Since the emergence of Hector Bellerin following a long-term injury to Debuchy, the French full-back has never been able to regain his place with the Gunners.
He recently turned 31, and with no regular Arsenal future seemingly on the cards; it makes sense for Debuchy to move out of North London.
A move abroad could work wonders for the talented right-back.