Januzaj scored the winner in United’s 1-0 win over Aston Villa on Friday.
The 20-year-old started alongside Depay, who joined United in a £31million deal from PSV Eindhoven this summer.
“The good news for Manchester United now is that Januzaj has come back into the equation,” Redknapp said on Sky Sports. “He looked like a young man that could go out on loan, with talk of Sunderland maybe taking him.
“I think they have signed Memphis Depay for £31 million but they already had somebody in their ranks that is more talented. [Januzaj] is a special player.
“I remember the first time I watched him for United and I think about the goal he scored against Sunderland – he can do special things with a football.
“He wasn’t magnificent [against Villa] by any stretch of the imagination but the arrogance he can afford to play with will come with confidence.
“He drifts past people and has a unique talent like that. He’s the special player in this team, I think. He can turn people inside out.”
