.
It was their third spot-kick of the match and came as referee Benoit Bastien felt Patrick Dorgu had been brought down by Hamari Traore.
But, as the challenge was being checked by the video assistant referee (VAR), Dorgu opted to try to overturn the decision himself.
The 20-year-old could be seen gesturing to the referee that it was not a foul – and VAR agreed, revoking the penalty.
United still progressed to the quarter-finals, scoring twice more to progress 5-2 on aggregate, but it was nevertheless an impressive act of honesty by Dorgu.
“It’s a good thing,” said United boss Ruben Amorim. “I’m proud of him. I cannot say if it’s 0-0 or [we are] losing if I have the same response.”
Football is a highly charged and competitive game, but there have been plenty of incidents in the past where sportsmanship overcomes the desire to win at any cost.
Here BBC Sport takes a look at some of the best examples from the past.
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