Bentley is set to seal a six-month loan deal to Birmingham, while Spurs have taken David Beckham on trial. Redknapp admits that the two players are ''similar'' but says he will give the disillusioned 26-year-old an escape route in January.
"I played him against Arsenal and he hadn't played for months. He'd been injured, he came back and played his first game in the Carling Cup and I thought he did well," he said.
"Yet I felt the crowd was on him a bit - they were waiting for him to make a mistake, and it's not easy when you play like that. He was a bit low after the game, I could see that. He was disappointed and I just felt maybe it's time for him to move on."
Bentley could find himself surplus to requirements with the expected arrival of winger Steven Pienaar in the summer, but Redknapp insists that the midfielder has the potential to resurrect his career.
"He could move on and do a fantastic job. That's my honest opinion," he said. "He can cross it, he can score goals, he can pick a pass. He's got no real pace. He is similar to [David] Beckham in lots of ways, he's got that unbelievable delivery of the ball.''