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 have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
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