Mainoo replaced Rasmus Hojlund in the 87th minute of the match, and Ruben Amorim's substitution proved to be a masterclass as the young midfielder scored the equaliser in the 120th minute, before Harry Maguire won it for the Red Devils against Lyon and booked their berth in the Europa League last-four stage.
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THE BIGGER PICTURE
As Mainoo scored his first goal since returning from a long injury lay-off, his mother could not control her emotions at full-time, as she told the Manchester Evening News, while shedding tears, "I can't believe it!". The teenager returned to action for United last Sunday against Newcastle United. He will turn 20 on April 19.
DID YOU KNOW?
United returned to winning ways for the first time since their 3-0 triumph over Leicester City in the Premier League on March 17. They will now aim to build on the historic comeback and hope to end a miserable 2024-25 campaign on a high.
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WHAT NEXT FOR MANCHESTER UNITED?
Ruben Amorim's side will be back in action on Sunday as they take on Wolves at home in a crucial Premier League clash.