6. Joel Campbell
Big things were expected from this guy this season after his stunning World Cup campaign with Costa Rica.
However, a brief display in pre-season and an awful performance in a Capital One Cup game is all Joel Campbell got at Arsenal before being sent out on loan to Villarreal for the second-half of the season.
The Costa Rican international is expected to leave the club permanently in the near future after failing to impress Arsene Wenger.
