Frank Lampard has emerged as an injury concern for England after pulling up in training on Wednesday.
The Chelsea midfielder was taking part in a routine session with his team-mates when he pulled up with a thigh problem. The injury will be assessed by the England medical team ahead of a scan on Thursday.
Liverpool’s Jordan Henderson, who missed out on a place in the initial 23-man party, has been placed on standby by England boss Roy Hodgson.
England have already had problems in the midfield department, with Manchester City’s Gareth Barry ruled out on account of a stomach problem. Versatile Everton player Phil Jagielka was called up to replace Barry, ahead of Henderson, but the latter may travel to Poland and Ukraine after all.
England begin their Euro 2012 campaign against France on June 11.