Diarra told arsenal.com: "I have great respect for the manager Arsene Wenger and am attracted by the style of football that the team plays. Of course I am excited by what the future holds and keen to play my part in helping Arsenal fight for trophies this season and for years to come."
Gunners boss Arsene Wenger said: "Lassana is a multi-functional player, making him a great addition to our squad. Not only is he hard working, he has a creative edge and is comfortable playing in the middle of the pitch or at right back."
