Juan Mata: United have to be ready for any Man City slip-ups

Juan Mata has warned Manchester City they can ill afford any slip-ups as Manchester United look to give them a bloody nose in the derby and gradually reel them in.

Pep Guardiola's in-form side make the short journey to Old Trafford on Sunday, when Jose Mourinho's second-place Reds will attempt to end their rivals' unbeaten Premier League run.