The youngster is out with an ankle injury sustained in the North London derby against Tottenham a week ago.
It is unclear how long he will be out for at present, with Arsene Wenger set to inform the media about his condition later on Tuesday.
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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.