England were waiting anxiously on Sunday to see whether Theo Walcott their star performer in the 3-2 win over Sweden on Friday would be fit to play in their crucial final Euro 2012 Group D match with co-hosts Ukraine on Tuesday.
England boss Roy Hodgson, who has been beset by injury problems throughout his Euro 2012 campaign, will make a final check on Walcott before his squad fly from their Krakow training base to Ukraine on Monday.
The 23-year-old - who scored and then created Danny Welbeck's winner against the Swedes to put England second on goal difference to France in the group - suffered a recurrence of a hamstring injury in training on Sunday.
"Unfortunately he had a slight setback in training today," Hodgson told the BBC.
"He felt the hamstring that kept him out for so long at the end of last season and that we were slightly concerned about when he came to us. But we have been lucky that nothing has occurred with that.
"In the little training session we had today we had to take the precaution of taking him from the field because he felt a slight tightness there."
Walcott will now be assessed by England's medical staff before Hodgson makes a final decision.
England just need a point from their match to guarantee a place in the quarter-finals while Ukraine realistically need to win to progress.
England are unlikely to take any risks with the injury in case it rules him out of the rest of the tournament.
Hodgson will be concerned that Walcott missed games at the end of the season with Arsenal because of the same hamstring problem and will not want it to develop into a full blown tear.
Arsenal manager Arsene Wenger must not only be fretting over Walcott's injury but also the future of the England star at Emirates.
Arsenal are in danger of losing both Robin van Persie and Theo Walcott who have just a year left in their contracts.
Gunners manager Arsene Wenger may be doing everything at his disposal to keep their talismanic captain Van Persie who is set to become the highest-paid Arsenal players if he decides to stay on.
Wenger has for some time now been preparing for life without Robin Van Persie who has been heavily linked with a move to Manchester City.
Notswithstanding his failure at the Euros where Holland failed to win a single match, Wenger will be doing everything at his disposal to keep their talismanic captain Van Persie who is set to become the highest-paid Arsenal player if he decides to stay on.
Arsenal already have Lukas Podoloski from Cologne for £10m and French champions Montpellier’s striker Olivier Giroud is the next target.
The rise of Walcott as one of England's stars in the tournament could trigger a move in the summer with Chelsea leading the pack for the Arsenal striker.
Walcott who earns around £70,000-per-week wanted to discuss a new deal in October.
Although informal talks have taken place, the club's failure to present him a new deal has raised doubt over his future.
Little is being done to make Walcott feel he is wanted at the Emirates, although the player has just one year left on his contract.
The Gunners could stand to lose in excess of £20 million if he goes on a free transfer next year.
Arsenal will hold crunch talks with Walcott after Euro 2012 as Wenger wants to resolve the forward's uncertain future.