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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.