Either way the Arsenal boss has obviously decided to make do without the 26 year old Frenchman who was once the answer to all of their defensive midfield problems.
Coquelin joined from French side Stade Lavallois in 2008 and went on to make 159 appearances for Arsenal. "I spoke on the phone, we had a good contact, a good conversation, so I am very happy to be here today", Coquelin said.
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The Spanish club agreed a £12 million fee for the holding midfielder, who started only one Premier League game this season, at centre back away to Manchester City.
"What he is doing at the moment will help him develop as a player because he plays in a different position but at some stage I will play him in at defensive midfield".
Coquelin has spent a decade in north London having made 160 appearances for the Gunners as well as having spells out on loan at Freiburg, Lorient and Charlton Athletic.