England manager Gareth Southgate could not guarantee a senior call-up in the build-up to the World Cup and it is understood the FA respect the player's decision.
He has yet to represent either country at youth level but has trained with Scottish youth sides in the past.
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.
"The majority of my family is Scottish", he told United's club website. I'm probably more Scottish than I am English but it doesn't bother me really.
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 worldwide career.
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"It is not easy and then national team will be just a effect of his work at the club but I can't confirm at all that both national teams have contacted him".
The next Darren Fletcher?
United boss Jose Mourinho had encouraged McTominay to follow his heart. Speaking to MUTV, he said: "Because it looks like England is missing him, if I was Alex McLeish, the first thing I would do would be to come to me".
"And I think people around him are the right people, I think".
The United manager added: "The kid is very "feet on the ground", he's very calm, so I think he passed some important tests not by the football point of view but the mental point of view - maturity, calm play against champions, play knockout in the Champions League, two tests by the mental approach".