In-form striker Romelu Lukaku made it six goals in six games when he netted the game’s sole strike after 20 minutes.

The Belgian converted the rebound after Saints goalkeeper Fraser Forster parried his header from Ashley Young’s cross.

And in a bizarre end to the match, referee Craig Pawson sent United boss Jose Mourinho to the stand.

The win maintains their unbeaten start to the season, yet they sit second in the table with rivals Manchester City ahead on goal difference.

But which players will Mourinho have been most impressed with?

CLICK THROUGH THE GALLERY ABOVE TO SEE OUR MANCHESTER UNITED PLAYER RATINGS FOR THEIR WIN OVER SOUTHAMPTON.