It was a feisty match at Old Trafford, which saw no fewer than nine players receive yellow cards and there was no shortage of flash points across the ninety minutes.
Collecting the ball wide left, Di Maria's perfectly-weighted centre left Mbappe with no option but to score after the Frenchman had burst past an unknowing United defence.
The end of Di Maria and Van Gaal's relationship wasn't good. Di Maria was handed the famed No. 7 jersey at the club, but the pacey wide man never really managed to live up to the lofty expectations that were placed on him upon his arrival.
In what can be deemed as one of the fixtures of the round, PSG will be hoping to fend off a spirited United outfit that looked to have shrugged off their difficulties endured under former manager Jose Mourinho. The injuries to Anthony Martial and Jesse Lingard towards the end of the first half necessitated a change in formation after the interval, with Pogba drifting further forward and into a central position, alongside substitutes Alexis Sanchez and Juan Mata in playing just behind frontman Marcus Rashford.
As the PSG players celebrated on the byline, an incensed Di Maria let out his frustration by screaming "F*ck off!"