Man Utd U17's Angel Gomes scores epic goal against Chile
McTominay, 20, has been at Manchester United since he was five and is a product of the Academy system.
The midfielder made his first-team debut away to Arsenal at the end of last season and featured in the Champions League in the 1-0 win over Benfica on Wednesday.
But fans who have watched the youngster at close quarters are not impressed - and have come up with conspiracy theories over why a deal has been done.
Those include the fact he's only been signed because he's tall and that he's there to fill a quota. Others, meanwhile, are fuming that Angel Gomes has still not signed a contract.
Gomes became the youngest player to make his United debut since the great Duncan Edwards last season at the age of 16 - although he has so far not signed pro deal.
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Scott McTominay has signed a new contract with Manchester United
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Scott McTominay came off the bench for Manchester United against Benfica
Reacting to United's annoucement on Twitter, one fan wrote: "Gets a new contract on basis he's 6"3 and not his footballing ability he's not on gomes' level."
Another tweeted: "I'll save you some time, sell him to the championship. Thats all he'll ever amount to."
A fellow follower said: "Won't even be here in 2021, just quota filling."
"I'm 6 foot do you think mourinho would sign me," said one, while another wrote: "He's absolutely g**h #fellainiwithoutanafro."
On signing McTominay, boss Jose Mourinho said: "I am delighted Scott has signed a new contract, he is one of our young players that has gone from strength to strength.
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Jose Mourinho has handed Scott McTominay a new Man Utd contract
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"He made his Premier League debut at the end of last season and made his Champions League debut this season. I had no hesitation in promoting Scott to the first-team squad last month as we have total belief in him."
But other fans fumed: "That’s not Angel Gomes lads. GIVE HIM A CONTRACT."
"next, gomes plzzz... did you guys see him #FIFAU17WC @agomes_47," said a fellow supporter.
While another disagreed with Mourinho and said: "i watch all Utd's games and U23 games, I have never seen anything from this lad that suggests he's good enough for utd!"
