Steve Bruce believes that the Belgian winger will reach the very top of the game.
Bruce, who is now manager of Hull City, was speaking to the press moments after he had witnessed just how devastating the fleet-footed Belgian winger can be.
He took his Hull City side to Old Trafford last night, where they were beaten 3-1, and the 19-year-old was one of the protagonists in United’s victory.
It was not Januzaj who will take most of the plaudits, though, as fellow youngster James Wilson scored his first two goals for the club, on debut, to take centre-stage.
United’s other goal of the evening was scored by Robin van Persie after Matty Fryatt had made things more uncomfortable than they ought to have been for Ryan Giggs’ men with a fine strike from 20-yards out.
This win, in United's final home game of the campaign, was a nice way to round off what has been a tumultuous season for Bruce’s former club. And the 53-year-old still thinks the future is bright at Old Trafford with the amount of talent they have coming through the ranks.
He said to reporters after the game: "We see the young players they've got today, Januzaj in particular, that kid's going to be a superstar isn't he?"
"If he keeps his feet on the ground, which I'm sure they will do here, then he's got everything the boy."
Januzaj has made 33 appearances for United, in all competitions, this season, scoring four goals in the process.