Ultimately, though, it is up to the player to make that decision.
Alex McLeish, the new Scotland manager, may be prepared to hand him a first call-up for next month's friendlies against Costa Rica and Hungary.
McTominay met with representatives from both English and Scottish camps this week to discuss his future, and it appears he's been more convinced by the latter. It probably depends where I am, if I'm at my grandad's it would have to be Scotland!
Former Scotland global James McFadden believes the news is like making a major signing.
The 21-year-old has made six appearances in the Premier League for the Red Devils so far this season and has been showing maturity beyond his years with his assured displays.
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McTominay is answering an emotional pull towards Scotland - his father is proudly Scottish - and he believes Scotland offer him the chance to carve out a significant global career.
According to The Times, McTominay had sat down with both Southgate and McLeish ahead of making his decision.
United boss Jose Mourinho had encouraged McTominay to follow his heart. I think his own heart is more important than my advice, because my advice is purely from the career point of view.
"I've never met them, but I have to believe the kid with his attitude towards the others and towards football, I believe the parents must be really good people that pass to him the right values".