Lassana Diarra wants to be transfered as he is finding it difficult to break through the talent the Gunners have in midfield. He says he was given reassurances by the recruiters who said he would be a very important part of the team. I think Diarra was a bit blinkered in his assessment. Its a very crowded midfield and you have to be very, very good to break into the starting squad.
He did not look very impressive in his matches against Villa, Newcastle, and Boro. Arsenal now have different priorities with Eboue and Toure off next month for the ACN, Wenger should put him up in the transfer market and start looking for some big name defenders to fill the gap. Phillipe Senderos does not look assured and Wenger might not want to extend Johann Djorou's loan to Birmingham.
let him go...he is not currently needed in the offensive passing squad