Aston Villa's Jack Grealish will not be eligible for a call-up to the England squad for at least a month.
The attacking midfielder has chosen to play for the country of his birth, rather than the Republic of Ireland who he has represented up to under-21 level.
But it is understood international clearance for the switch will not be cleared for four to six weeks.
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England manager Roy Hodgson names his latest Euro 2016 qualifier squad on Thursday.