Redknapp insists it might be hard to convince Beckham to sign for the club when he won't be a regular starter at White Hart Lane.
"It's a difficult one," he told talkSPORT. "I had him training here last year not only as a player but as a fellow around the place, he was a different class. Everybody absolutely loved him, he had time for everyone - he was just superb.
"He was great to show any young player how to behave, you come in you train hard, he was the first one in every day, he left late, he'd go to the gym after training, he had time to sign everybody's autographs.
"He's still a fantastic footballer. The problem is that he plays wide right. I've got Aaron Lennon who plays there, Rafael Van Der Vaart can play there at a pinch in certain games . Where ever he goes he's going to want to play so it's not going to be easy to say I can guarantee him a place in the team, that's the problem.
"I wouldn't say it's a definite no-no with Tottenham but I think he's going to want to play regularly, that's the problem. I couldn't sit and say he'd play every game, if he wants to play every game it may be a problem.
"I could see him coming back to England somewhere and playing, I'm sure there will be plenty of takers. You'd want him around your football club because he's such a good influence on everybody."