England will already be without one centre-back in February as Millie Bright continues to recover from a knee injury of her own. Williamson's absence could well open the door for Lotte Wubben-Moy to get some action then, with the 25-year-old one of Arsenal's top performers in Saturday's win over United.
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An update on Williamson's place in the England squad will follow in the coming days, with the Lionesses' first fixture to come on Friday against Austria.