But the manager says that it would only be the one game that he misses and would be very likely to return to action at Reading on Saturday.
Valencia sat out the 3-1 win over QPR and Sir Alex Ferguson spoke about why he missed the game.
He told MUTV: "He had a hip injury."
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."