The 27-year-old was ruled out of the Red Devils' 3-1 victory over QPR and the Champions League defeat after being subbed halfway through the second half of United's loss to Norwich, and Sir Alex Ferguson says the Ecuadorian will miss the upcoming encounter with the Hammers but should be back in the next week.
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"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."
United's win took them to the top of the Premier League, though neighbours Manchester City have a game in hand against Chelsea on Sunday.