According to multiple reports, McTominay has decided to choose his father's native land of Scotland over his own home country.
Reacting to the news on Monday, former Scotland striker and Sports Breakfast host Alan Brazil suggested the youngster "wants to be a Graeme Souness rather than a Jordan Henderson".
"He obviously wants his summers off", Barton said, per the Daily Record.
New Scotland manager Alex McLeish travelled to Manchester United's training base in Carrington last week and persuaded McTominay that his worldwide future lay in dark blue.
But if McTominay genuinely feels more Scottish than English then he has made the right decision, even if that means he'll never play in a World Cup finals.
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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 worldwide career.
McTominay's manager, however, believes that he should concentrate on his Old Trafford career and claimed to have no knowledge of England and Scotland's tussle for the player.
The fast rising star is expected to be named in Scotland's squad for the games against Costa Rica and Hungary this month.
He added: "A lot of guys are just coming to play for us to top up their CVs and boost their sponsors, so it doesn't sit well with me".
"It is also unfair on the players who will miss out on playing for their countries but it is the clubs' fault, not letting their players play in the youth teams and allowing it to get to this stage". Either England have been very slow and showed no interest or he feels very strongly about it. I'm probably more Scottish than I am English but it doesn't bother me really.