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The Frenchman opened the scoring with the cheekiest of spot-kicks in the thrilling game at the AMEX, leaving De Gea looking like a fool.
Naturally the Spaniard was not best-pleased after being outwitted and Steve McManaman picked up on how he reacted.
Speaking on co-commentary on BT Sport, he said: "But when the ball goes out the net, David de Gea kicks the ball at Maupay. He doesn't kick it very hard but you can see the frustration in the keeper. But it's a brilliant penalty."
There was no TV footage of it at the time but a clip of De Gea kicking the ball at the feet at the former Brentford striker has emerged.
It wasn't exactly blasted at him but it's clear to see just how annoyed De Gea was for conceding such a goal.
Maupay also produced the 'crybaby' celebration made famous by Kylian Mbappe ahead of it making its way to FIFA 21 next month.
But he was served some karma in the game's dying embers, as just moments after Brighton thought they had claimed a point when Solly March nodded home in the 95th minute, the 24-year-old blatantly handled the ball in the area.
The referee had blown his whistle for full-time but went to VAR and subsequently awarded the spot-kick, which was duly converted by Bruno Fernandes in the last kick of the game.
Incredible drama as Man Utd beat Brighton with 99 minutes on the clock :open_mouth:- Football on BT Sport (@btsportfootball) September 26, 2020
The referee had blown the final whistle, only for VAR to award a penalty for a clear handball...
Bruno Fernandes buries it to win 3-2. pic.twitter.com/CP7bKhGLn7
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