Walcott missed training with England on Monday after feeling unwell.
The winger was ruled out of the squad for the clash with Ukraine on Tuesday.
“Theo has picked up some sort of virus,” said England boss Roy Hodgson. “He was quite violently ill last night.”
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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.