Some United players never get a song, but it's taken just a handful of games for the 18-year-old to get his.
"I've got to tell you, I might as well do," sing the United supporters, "about a boy who can do anything." There's of course some creative freedom with the lyrics because as impressive as Januzaj's start has been he's not yet completely polished.
Even as a raw teenager, Januzaj is still playing a huge role in keeping United's season alive.
Under different circumstances, his first season with the first team would be a bonus. But rather than the Belgian-born midfielder becoming reliant on David Moyes' faith to keep putting him back in, the United manager is becoming increasingly reliant on Januzaj.
After 13 minutes of their visit to Hull City on Boxing Day, United were already down, 2-0, as Antonio Valencia and Ashley Young toiled on the wings without creating anything for Wayne Rooney or Danny Welbeck.
Then came a blessing in disguise when Rafael hobbled off with a groin injury and Moyes threw in Januzaj. Less than 10 minutes later, United were level.
Januzaj only had an indirect role in both goals, but his introduction changed the game, as he immediately looked to get behind Hull's back four.
Maynor Figueroa was booked for bringing him down, which led to Chris Smalling's goal to get United back in the game. It forced David Meyler back to help out, and in the blink of an eye, Hull's threat down their left side had disappeared—at least for the rest of the first half.
Januzaj's great quality is his fearlessness. He's not scared to run at defenders, nor worried that every now and again, he's going to lose the ball.
It's an attribute shared by most of United's great players, such as George Best, Eric Cantona and Cristiano Ronaldo.
Those players became so good and achieved so much that their songs are still sung at Old Trafford despite all three being long gone. That's the next challenge for Januzaj—to make sure they're still singing about him in 10, 20 or even 50 years from now.
With United up, 3-2, against Hull, the United fans inside KC Stadium started singing their traditional Christmas tune "The 12 Days of Christmas" in honour of their favourite Frenchman, Cantona.
Seamlessly, they led into "I've got to tell you, I might as well do, about a boy who can do anything." That's the company that Januzaj is keeping these days.