Manchester United manager Louis van Gaal has rejected reports claiming that Anthony Martial will be ruled out for weeks.
The Frenchman was injured in the mid-week friendly international against England and will not feature against Watford this weekend.
But he could be back for the Champions League home game against PSV Eindhoven on Wednesday.
"I think that everybody knows Michael Carrick and Anthony Martial are injured, but also injured is [Marouane] Fellaini," van Gaal revealed.
"That's a surprise because I thought he was recovered after the international break, but still he is injured. And that's a big blow because Rooney is ill, so we have a big problem, I think.
"It's [Anthony Martial's injury is] not so heavy as everybody has written in the media, but he cannot play against Watford.
"Maybe PSV for Martial but it's not certain, and I think Rooney shall also play then because illness is not something of many days.
"And [Antonio] Valencia, of course, has been operated on before the international break already, then [Luke] Shaw, so we have five injured players, and that's a lot.
"Michael [Carrick] is also not a heavy injury, he shall be playing much quicker than everybody has written.
"[James] Wilson is okay after the international break. He can play but he cannot play a whole match because he doesn't have the rhythm of the game."