After he was sold by United last summer, Mctominay not only finished the season as title winner, but also Serie A player of the year.
Charlie Jackson was McTominay's first coach at United and he told The Sun: “There were no video telephones in those days, but I wish we could have filmed him as you had seen a special player.
“I have his first shirt, his first training shirt and his first football – that we had in a glass cupboard – because you knew it. You just knew it.”
He added: “He was persistent, he wanted to learn.
“We would perhaps spend 1½ hours on a session and he would spend 20 minutes later, want to control what he had just done.
“I should have a few children to do an exercise and do the same with him again because he just wanted to get it.
“It is rare that you see that in a child of that age.”
Mourinho Fantastic for McTominay
Jackson also wanted to emphasize the influence of the former United manager Jose Mourinho, who gave McTominay his debut.
He said: “Jose was just fantastic for him. Gave him his debut, took care of him.
“Scott always works on trust and a pat on the back. If you believe in him, he will run coal for you. Conte has done that. Mourinho did that too.”