Manchester United defender Marcus Rojo has been forced to leave the field in the second half of Sunday afternoon's derby against Manchester City with a suspected dislocated shoulder.

The Argentine stayed on the ground following a challenge with Martin Demichelis outside his own box, and an oxygen mask was quickly called for.

Rojo left the field on a stretcher, with Paddy McNair coming on to replace the centre-back.

United were reduced to 10 men in the first period of the Premier League clash after Chris Smalling was sent dismissed.