If the injury is as serious as first feared Barkley could miss England's 2016 European Championship qualifiers against Switzerland, San Marino and Estonia.
Barkley enjoyed a brilliant breakthrough season last term which culminated in selection for England's World Cup squad where he made three appearances.
He signed a new four-year contract at Goodison Park in July and has played in three pre-season games for Everton who open their league campaign at promoted Leicester City on Saturday.
(Reporting by Tom Hayward; Editing by Ken Ferris)
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