Barton, who has one England cap to his name, claimed that McTominay's decision could have had more to do with a lack of ambition than a burning desire to represent Scotland but went on to give the youngster the benefit of the doubt. The time has now come for the 21-year old from Lancaster, England to select what nation he will play for internationally.
And asked for his view, Barton said: "What's he playing at?"
McLeish then met with the player at United's Carrington training complex on Thursday to persuade him to choose Scotland.
And according to Jonathan Northcroft of the Times, he has opted to play for Scotland. "If he's got that, it'd be very hard for him to play for England".
"It is not easy and then national team will be just a outcome of his work at the club but I can't confirm at all that both national teams have contacted him".
With Scotland requiring something of a shake-up following a disappointing conclusion to Gordan Strachan's reign, McLeish is clearly attempting to inject the squad with some young prospects.
"He'll know that, he'll adapt, and I think the biggest thing is not to put too much pressure on it. Let him find his way, ease his way into it and get that team ethos coming across". "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".
Fletcher who played in Scotland's final two World Cup qualifiers against Slovakia and Slovenia last October, is waiting to discover whether he will remain part of new Scotland boss McLeish's plans.
"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".
"Scotland have improved the last qualification campaign and if he feels more Scottish than English fair play to the kid".