Manchester United defender Nemanja Vidic has been injured in the first-half of United's Champions League first-leg match against Roma at the Stadio Olimpico on Tuesday night.

The 26-year-old Serbian international landed awkwardly after a routine header and was forced out of the match just after the half-hour mark.

He was replaced by John O'Shea, with the score still level at 0-0.

The full extent of the injury is still unknown, but it looks like Vidic is likely to miss some crucial matches as the 2007/08 season comes to an end.