Pickford had been due to link up with England's Under 21s but will now serve as cover for Joe Hart and Fraser Forster.
England play Slovenia in Ljubliana on Tuesday looking for their third consecutive win in Group F.
The England website also said Arsenal left back Kieran Gibbs had joined the squad as cover after Ryan Bertrand was injured early in Saturday's victory over Malta.
(Reporting by Martyn Herman, editing by Neil Robinson)
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