The Gunners star suffered the injury in the midweek Champions League play-off win over Fenerbahce.
“His hamstring is much more damaged than we thought at the start,” Arsenal boss Arsene Wenger said.
“It is very disappointing and we have paid a very heavy price for that win. We have to be patient now.”
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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?