20 September 2013 Last updated at 13:32

Pat Nevin analysis: Are teams targeting Man Utd defence?

BBC Sport's Pat Nevin looks at the methods opposition teams are using in an attempt to breach Manchester United's defence.

Nevin questions whether opposing managers and players are starting to try to "isolate" 34-year-old Rio Ferdinand, who moved to Old Trafford from Leeds in 2002 for £30m.

Nevin was speaking before Manchester City beat David Moyes' side 4-1 in the Premier League at the Etihad Stadium.