Manchester United: Why is Angel Di Maria struggling?

BBC Match of the Day 2 Extra pundits discuss Manchester United winger Angel Di Maria's current form, after he was substituted at half-time during their 2-0 win over Sunderland.

Sunday Mirror journalist Andy Dunn says United have "a real issue" with the Argentinean and believes he had "45 basically appalling minutes" against the Black Cats.

Di Maria has scored three goals in 19 Premier League games for the Red Devils since joining for a British record transfer fee of £59.7m from Real Madrid.