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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.