Walcott sustained a slight pelvic tear on Friday and was sent home from international duty to return to his club.
The injury could keep him out for 10 days, meaning he may not return until April.
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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.