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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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.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?