Ole Gunnar Solskjaer’s men suffered a gut-wrenching defeat out in Switzerland on Tuesday night, with Young Boys snatching a 2-1 victory in the dying seconds of stoppage time.
Before that late drama played out at the State de Suisse, however, play was halted when a fan got past security and burst onto the pitch in the 78th minute.
The invader could be seen running past both sets of players as United lined up a free-kick, before trying to pull off an audacious somersault.
United eventually slumped to the most agonising of defeats on a disappointing night out in Switzerland, despite Cristiano Ronaldo firing them in front after 13 minutes.
Bruno Fernandes teed up his Portugal team-mate, whose close-range effort crept through the legs of Young Boys goalkeeper David von Ballmoos.
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A pitch invader is tackled down by a steward during the UEFA Champions League group F match between BSC Young Boys and Manchester United at Stadion Wankdorf on September 14, 2021 in Bern, Switzerland
Security eventually intervened to escort him off the field and allow play to continue (Image: GETTY)
But 10 minutes before half-time the game was flipped on its head when Aaron Wan-Bissaka received a straight red card for a dangerous challenge on midfielder Christopher Martins.
Solskjaer admitted after the defeat that Wan-Bissaka’s red card cost them, saying: “It looked like a well-earned point and a good point in a difficult game.
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“When you get the first goal you think you’ve got a great chance, it’s enough to win the game but unfortunately that sending off will always have an impact.”
He added: “Aaron gets a touch that’s too far, and he gets the ball but he follows through. It’s hard to argue against the referee but then again he didn’t go through his ankle, he hit him on the top of his foot. It was never a malicious tackle.”