Micah Richards fears he may be sidelined for a month with a hamstring injury, a timescale that would rule him out of Manchester City's FA Cup semi-final with Manchester United.
Richards lasted just five minutes of England Under-21s' 4-0 win in Denmark. He pulled up sharply and after treatment he was taken from the field on a stretcher.
The defender will head back to Eastlands for assessment, but he has already informed U21s' boss Stuart Pearce that he fears a month-long absence.
"Micah's injury was the only downside of the night," Pearce said. "He's got a hamstring problem. We don't know how serious it is yet but he's already diagnosed himself as being out for four weeks. But that's 'Dr Richards' talking though. It could be four days.
"So we'll see. Let's hope for City's sake and our preparations this summer it's not too serious."
City face United at Wembley on April 16, which hands Richards three weeks to shake off his injury.