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|Manchester United's Scottish midfielder Scott McTominay AFP/Oli SCARFF|
The 23-year-old academy graduate made his debut in 2017 and has made 75 appearances for the side, scoring six goals.
"Whilst I understand that we all have so many other things to think about at the moment, I'm so happy to sign this contract and play a part in the future ahead for this team," the Scotland international said.
"All I have ever known is United and I hope that my passion for the club shows every time I go onto the pitch. I'll continue to give everything for this club whenever I pull on the shirt."
McTominay has made 28 appearances in all competitions this season, despite missing two months due to a knee injury, and has been one of manager Ole Gunnar Solskjaer's standout players.
"Scott has done tremendously well since I joined and has been a vital part of our midfield," the United boss said.
"He brings determination, tenacity and skill to the game and we know that Scott's attributes will be a major asset to the squad over the coming years."