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.
And the Manchester United manager had some special advice for the 21-year-old ahead of Monday's game.
Hearts manager and director of football Levein, who managed Scotland between 2009 to 2012, hopes to see more young, eligible players commit their futures to Scotland in an "exciting" time for the national side, who face Costa Rica and Hungary in friendlies later this month.
Speaking in September 2016, McTominay admitted he felt more Scottish than English.
Former Scotland worldwide James McFadden believes the news is like making a major signing.
"I know you don't really sign players for the global team but England were interested in him, and it's fantastic he's chosen to play for Scotland".
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I think if they're not on the radar for the England team then it's much easier.
Scotland certainly have a talented player on their hands as well and would do well to build around him and other young Scottish stars in their bid to qualify for the next World Cup. He's probably realised the weight of playing for England and working every summer, he doesn't want that.
He said: "Because it looks like England are missing him, if I was Alex McLeish, the first thing I would do would be to come to me".
"Going forward, it's up to Alex McLeish, I've not spoken to him yet but I'm sure I will do in the near future and see what the plans are".
"I don't know him but I think he'd have had a great chance of being in an England squad and being involved in a World Cup".
Fletcher left United in 2015, when McTominay was still emerging, but he has been encouraged by what he has heard from United players and coaches.