Ferdinand has seen Januzaj from close quarters since the teenager joined United from Anderlecht two years ago aged 16.
He said: "I don't want to talk him up too much but he is a talented young kid, he can be a top player.
"He has great balance and great feet and I think he'll be a real big asset to Manchester United some day. He has got the desire to succeed.
"He's confident and he has also got that bit of arrogance about him that you want a player to have - the belief in himself that he can be a player."
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