Former Manchester United striker Dimitar Berbatov says they need a shot of passion for Monday's clash with Arsenal.

United will welcome the north Londoners to the Theatre of Dreams on the back of two disappointing results, a 2-0 defeat to West Ham and an unconvincing penalty shootout victory over League One side Rochdale.

"United's game against Arsenal will be their biggest test in the league so far," Berbatov told Betfair.

“United will have some advantage of playing at Old Trafford, but when there results haven't been going for you, you know the fans will be a little impatient, you can think too much about it, make mistakes and it becomes a difficult situation.

“Sometimes when I have watched them I have noticed that United are have been too soft against the opposition, they need to be tough in their challenges, show them who's in charge and let them know that this is f*****g Old Trafford."