As Arsene Wenger prepares for battle against Man United and a meeting with former Emirates Stadium skipper Robin Van Persie, we take a look at ten players the North London side should probably have kept hold of.
10. Alex Song
Surprisingly allowed to leave Arsenal despite being tied down to a long term contract. Arsene Wenger meekly accepted that the Cameroon international wanted to join Barcelona, despite the fact that just days before his departure he had stated his intention to stay at the Emirates Stadium.
Currently struggling to force his way into the Nou Camp starting eleven. Wenger saw Abou Diaby start the season well before an inevitable injury and now Mikel Arteta is being called upon to adopt a more defensive midfield role than he is used to.