Tottenham have revealed that Gareth Bale suffered a grade one hamstring strain while on international duty with Wales, with the winger facing a race against time to be fit for the club's Champions League clash with Real Madrid.
Bale, 21, withdrew from the Wales squad last Saturday - ahead of his country's Euro 2012 qualifier against England - after pulling up in training and was sent for a scan on the injury on Monday.
The results revealed a grade one strain, which usually takes between seven and ten days to heal, leaving the Spurs star as a doubt for next Tuesday's Champions League quarter-final trip to the Bernabeu.
The club will continue to monitor Bale's progress ahead of this weekend's match against Wigan, but his participation against Real depends on how well he responds to the conditioning of the injury.
Tottenham's head of medical services, Wayne Diesel, said: "Gareth did not report any hamstring issues when we assessed our players after our fixture with West Ham United which means he was free to report for international duty, nor did the Football Association of Wales raise any problems with us prior to his first training session with the national team on Tuesday following two days of rest.
"He was passed fit to train by the FAW medical team and it was only after 40 minutes of his first training session on Tuesday, which included some high intensity runs, Gareth complained of tightness in his right hamstring and was pulled out of the remainder of the session as a precaution.
"We requested the player be sent immediately for a scan which subsequently revealed the hamstring strain that forced his withdrawal from the squad. Gareth has returned and taken part in controlled straight-line running so we could assess him.
"We sent him for an ultrasound scan examination this afternoon and that has confirmed the presence of a minor grade one hamstring strain. Gareth has reported no pain or stiffness after taking part in the running this morning and we shall continue to monitor him and see how he responds to his conditioning programme throughout the week."
Bale has only recently returned to the Spurs first-team picture after six weeks out with a niggling back injury and has played less thank three hours of football in the past two-and-a-half months.
But Tottenham boss Harry Redknapp will still be hoping to have the Welshman back to play in a compeition in which he has flourished this season, scoring four goals in seven games - including a memorable hat-trick against Inter Milan.
Spurs will also be sweating on the fitness of Aaron Lennon, who left the England squad on Monday after complaining of some discomfort in his hamstring.