Despite some seduction methods by England in recent days, McTominay has opted to represent Scotland at global level.
He has yet to represent either country at youth level but has trained with Scottish youth sides in the past.
In a similar move, Scotland boss Alex McLeish met the youngster at the Red Devils' Carrington training ground on Thursday to try and secure the player's allegiance.
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McLeish is expected to now include the 21-year-old in his squad for the friendly double-header against Costa Rica and Hungary at the end of March.
Ultimately, though, it is up to the player to make that decision.
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.
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"Who will I support in the World Cup qualifiers? It's a bit of both - I want them both to do well".
McFadden, who has held talks over joining McLeish's coaching team, told BBC Radio Scotland: "His stature, how he goes about his game, he reminds me of Darren Fletcher, and if we can get someone who has been as good for Scotland as Darren Fletcher it's a great acquisition". "I can't confirm because I have no information about that and my advice to him is not about national teams, is not about that".
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And she called for "mutual recognition" in areas like regulation of goods, broadcasting licences and professional qualifications. And her proposal for the future customs setup will be hard for the European Union to accept.
Speaking last month, Mourinho said: "I gave him my advice, but I think the parents' advice is more important than mine. He has the right people around him".