Nemanja Vidic will miss the Manchester derby after failing to recover in time from a knee injury.
It had been thought that the Serbian defender would be fit enough to play against Cluj in the Champions League, after training with the Red Devils on Tuesday morning, but Old Trafford chief Sir Alex Ferguson has confirmed that the 31-year-old would miss the encounter.
Ferguson went on to state that, because Vidic missed the match against the Romanian side, he would not be considered for selection for Sunday's crunch tie against the top-two.
"I do not think he will play [against Cluj]," said Ferguson. "He feels he needs another few days' training. He will not play in the derby if he doesn't play tomorrow, although I wasn't considering him for Sunday anyway."
Ferguson also confirmed Japan international Shinji Kagawa had returned to training after his own knee injury and there is an outside chance he could be involved at the weekend.
"He's showing good promise now. It is much better and I don't think he is far away," said Ferguson.
Meanwhile, Ferguson confirmed that while he will make changes to his line up tomorrow, Wayne Rooney will be in his starting XI.
You can listen to exclusive national radio commentary of Manchester City v Manchester United in the season's first Manchester derby this Sunday from 1:30pm, only on talkSPORT