United are known for their incredible youth academy and McTominay is one of the most recent graduates to make a name for himself.
Speaking to the Sun, the Scotsman explained that he didn't like the rule about black boots but sticking to it meant no one had an ego and that brings success, saying, "I probably couldn't tell you one player in the club who likes wearing black boots.
"But it was the rules and something accustomed to every academy player and if someone tried to come out in red boots it's like 'you're no different to any of us so get your black boots back on until you earn the respect and right to wear coloured boots'.
"I didn't like the black boots. But you had to do it. You had to respect the rules.
"There are no big egos, there's no young kids coming in wearing jewellery and looking a bit flash, that's not the case at this club."
Continuing on about how the 'DNA' of the system goes through the team he added, "You don't realise at the time how much little things like that at the time are going to help you.
"You think 'this is rubbish' and 'what's going on?' but then you get older, you look back and you think all of those little things have stood you in so much good stead.
"Now I look back and, being one of the older academy players now, those standards have been passed through, so everybody has the idea of what a Manchester United player should look and be like, the DNA that comes with wearing that badge."
McTominay has been a key player in Ole Gunnar Solskjaer's squad since the Norweigan took over back in 2018 and is relied on in big games.
The 24-year-old is a big fan of his current manager and told MUTV last year: "Obviously it's our duty as players to go out there and do our best for him and hopefully we can (perform well) because we love him. We love him as a group as well."
Featured Image Credit: PA Images
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