Luke Shaw is believed to be determined to prove his fitness ahead of the weekend's Manchester derby, says The Telegraph.
The Manchester United left-back is in doubt for Saturday's clash with neighbours Manchester City at Old Trafford after returning to the club prematurely from England camp.
Shaw, 21, complained of a sore calf, on the same leg as he badly broke last year, during England's training session on Saturday morning, prior to their World Cup qualifier against Slovakia the following day.
The defender returned to Manchester for treatment in a bid to make the encounter with City with England boss Sam Allardyce saying it was more precautionary than anything else.
Jose Mourinho may yet leave Shaw out of his team for fear of further aggravating the affected area but Shaw is desperate to be a part of United's starting XI.