England defender Ashley Cole gave Roy Hodgson a new injury headache as he had to withdraw from training early.
The Chelsea left-back was escorted of the training pitch by physio Gary Lewin and it is not clear what the concern is.
Cole is an integral part of the England back four and considered to be one of the finest left-back's in the world.
Should he fail to prove his fitness, Hodgson could draft Leighton Baines into the team as a replacement.
The Football Association, however, have played down concerns about Cole's fitness, but have declined to provide a reason for him leaving training early.