Manchester United winger Antonio Valencia is set to sit out Wednesday's match against West Ham with a hip injury.
The United midfielder missed out on Saturday's 3-1 victory over Queens Park Rangers, and Sir Alex Ferguson confirmed the complaint will keep him out this week.
But the Ecuadorian should return next week.
"He had a hip injury," Ferguson told MUTV. "Just towards his back. He's had a bit of pain there for the last couple of weeks but he's been playing with it. That's the type of guy he is. He never mentioned it and plays on.
"All of a sudden, you ask him and he says: 'Yes, it's sore.' It won't be too long and he should be ready for maybe next week."
The Manchester United winger was named the club's Player of the Year last season, and the former-Wigan star has established himself as a crucial part of Ferguson's team since his £16m switch in 2009.
But with Valencia out, Ferguson now has a problem in the wide areas, as Nani is also injured. Against Queens Park Rangers, the Manchester United boss opted for a narrower formation, with only Ashley Young on the wing.
And for the 12th time in 20 matches, United fell behind this season - Jamie Mackie opening the scoring for the Super Hoops seven minutes after half time.
But the introduction of Javier Hernandez and Anderson helped to change the game, and goals from Jonny Evans, Darren Fletcher and Chicharito turned the tie around to give United a 3-1 victory.