McTominay has been singing the youngster's praises ahead of Monday night's meeting with Wolves.
“It's amazing, the transition," McTominay told Sky Sports. “I used to get that all the time, 'he's so much bigger, so much stronger now' and it's like, I don't see it because I'm just myself.
“Mason is another one who has just grown and grown and in every single training session you're seeing more from him.
“The manager was a striker and Mason is as well and I'm sure Mason will be getting a lot of different coaching and different ways in which he can follow in the footsteps of some amazing strikers that have played at this football club as well."