It is a significant blow for Newcastle to be without the French midfielder.
Manager Alan Pardew said: “He will definitely have an operation, and we think it’s going to be on Friday or Monday, I’m not sure. That’s a blow to us because he’s a top player for us.”
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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.