Ferguson compared the 24-year-old, who came through the academy ranks at United, to Darren Fletcher and Brian McClair.
"We've been blessed," Ferguson said.
"I signed him when he was seven or eight years of age. McTominay is of a similar type to Darren. A bit long, lanky, a good winner of the ball, a good turn of pace going forward, a great attitude to the game.
"Going back to my time, we very seldom left Darren out of big games, especially against Arsenal. He was fantastic against them. If you put him against [Patrick] Viera, no problems.
"It's really rewarding for me to see a Scot coming through. Darren was one, McClair was a great Scot for us, a fantastic player.
"We've been blessed with great Scots right through going back to the king, Denis Law. It makes you proud."