Arsenal youngster Emile Smith Rowe and West Ham United midfielder Declan Rice both sat out training with England on Tuesday.
West Bromwich Albion goalkeeper Sam Johnstone - called up in place of the injured Aaron Ramsdale - was also absent.
Manchester City winger Raheem Sterling was given permission to leave the squad to attend an event in Jamaica at the invitation of the Duke of Cambridge.
England are set to play Switzerland and the Ivory Coast in friendlies this week.
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