The Frenchman limped out of the match after just a couple of minutes and will now only return towards the end of the year.
“He has a groin strain. That’s usually three weeks,” Arsenal manager Arsene Wenger told reporters at Goodison Park.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.