United's announcement prompted some emotional comments from the club's supporters, with many expressing their sadness.
"It was time to move on, but I felt this one, not going to lie," @UtdFaithfuls wrote on X.
"I miss him already. What a player," said @sanixutd, while @Annychizzy wrote: "The tears are flowing now. Thank you for everything Scott."
"All the best Scott. I know it's the right move for you," said @abhishek_ux. "But losing someone like you will always hurt. Hope you will show the owners and be back here one day for sure."
Another fan, @da_yellaman, said: "I'm absolutely heartbroken by this. I absolutely love Scott McTominay and whilst I'm absolutely delighted for him to get this move, I'm gutted he's gone. Thanks for everything [McTominay]. All the best."
"I'm usually glad to see the back of most players leaving United lately, but I'm gutted to see McTominay leave. Gave everything for the shirt," @cameron91 commented.