Manchester United boss Sir Alex Ferguson admits Nemanja Vidic is out of tomorrow's derby at Manchester City.

Vidic remains a doubt for Monday's clash after the captain sustained a thigh injury during last weekend's 1-0 victory at Sunderland with Jonny Evans also struggling to make Monday's encounter.

"Vida got injured at Sunderland," confirmed Sir Alex. "Early on, he had a clash and had a bit of treatment and then he had a clash with David De Gea near the end of the game. It's not serious, just a nerve in his calf, so he should be maybe back in training over the weekend.

"I've got Rio Ferdinand, Chris Smalling and Phil Jones so I've got the right cover, I think."