Alex Oxlade-Chamberlain's participation at the 2014 World Cup is in serious doubt after it was widely reported he will be out for a minimum of 10 days.
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England midfielder Chamberlain limped off in the second half of his nation's 2-2 draw with Ecuador after a collision with Carlos Gruezo.
Three Lions boss Roy Hodgson outlined his fears about the extent of the injury after the match, with the England's first game in Brazil on June 14 against Italy.
On Thursday, Ben Dinnery, injury expert at physioroom.com, told ESPN FC: "Ecuadorian midfielder Segundo Castillo suffered a knee ligament injury last weekend but was still named in his nations 23 man squad after doctors advised a likely return within three weeks."
Hodgson can replace Chamberlain in his 23-man squad up until 24 hours before England's first game in Manaus.