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Unhappy at the perceived theatrics of Arsenal's Alexis Sanchez, the United boss made his feelings clear to Dean by mocking his actions on the touchline.

His colourful protest drew an enormous cheer from United fans, and even a sporadic and rare outburst of 'Louis Van Gaal's red and white army' from the Stretford End. 

'That was too emotional - it is not good for the referee and the linesman and the fourth official,' Van Gaal reflected afterwards post-match.

'It doesn't happen much normally - I have had a lot of criticism because I am sitting on my bench and now I am off my bench and I have lot of criticism because I'm doing that.

 

'I have apologised to the referee and the linesman and I hope everything is solved. I have to control my emotions and I have said that also to my players.'

Gunners boss Arsene Wenger would only offer a wry smile when asked to venture an opinion on his opposite number's touchline antics.

'Nothing,' Wenger replied. 'You will have to ask him the question. I do not want to comment on that because [you will say] I'm a bitter loser - I am, in fact.'

Despite his anger at the time, Van Gaal's emotions were of a happier nature come full-time as his injury-ravaged side defeated Arsenal.

Teenage striker Marcus Rashford continued the dream start to his United career, scoring two goals and setting up another.

Only playing because of United's chronic injury crisis, the 18-year-old Rashford marked his league debut by scoring in the 29th and 32nd minutes to put his team 2-0 ahead - three days after a double in the Europa League against Midtjylland on his senior United debut.

After former United striker Danny Welbeck replied for Arsenal, Rashford set up Ander Herrera for a shot from the edge of the area that deflected in off Laurent Koscielny.

Mesut Ozil made it 3-2 in the 69th minute but fifth-place United held on comfortably to move three points off the top four. 

Arsenal, who put in an off-colour performance against a young and injury-hit United side, dropped five points behind league leaders Leicester. 

The North London side haven't won in the league at Old Trafford since 2006.