Barcelona have agreed to pay around £15million for the Cameroon international midfielder.
The 24-year-old has signed a five-year contract with the Spanish giants.
“Everyone at Arsenal would like to thank Alex for his contribution to the club and wish him the best of luck for the future,” read a statement on Arsenal’s website.
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Chelsea legend Didier Drogba has revealed his top 11 Chelsea career moments during his recent interview on Chelsea TV.
The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.