The 18-year old was booked for simulation in United's 3-1 win at Old Trafford on Saturday with his decision to dive being met with derision from Welsh centre-back Collins.
However, he feels it will be a learning curve for Januzaj who will erase that part of his game and go on to be a superstar.
"It's cheating basically," Collins told Weekend Warm-Up on Sky Sports News.
"I don't like to see it in the game. He probably thinks I am going to stick my leg out and he's probably already thinking about going over.
"Obviously he's taken a dive. He's a young lad, a great player, I'm sure he will learn. David Moyes seems to have this conversation quite a lot at his club with Ashley Young. It happens in football. He (Januzaj) is a great player and played very well at the weekend. He's learning the game and if he carries on playing the way he is, he is going to be a top-drawer player."
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