United have been heavily linked with a move for the winger and Redknapp believes that he would be quite the capture for Jose Mourinho's side.
Speaking to 'Sky Sports News' ahead of the new season the former Liverpool man said:
"If it did (happen) I think you should just give Manchester United the trophy now,"
"It won't be to do with anyone else because Gareth Bale is that good. He would rip the Premier League apart if he came here.
"I think the way that he plays - in that team - he would be sensational. There are only a few players that can do what he can.
"He is sensational. He is made for the Premier League."
Fellow pundit Thierry Henry agreed with Redknapp though he did say that United would not be the only interested party should the Welshman be made available for transfer.
"He is made for every league," Henry said.
"If he becomes available I don't think it will only be Man United going in for him. But on the other side how many teams could compete with Manchester United could offer?
"When you have a guy like Gareth Bale he gives you another dimension. If he leaves I'm sure he (Jose) will try and buy him - and if he comes then watch out everybody."
Despite the high praise and Mourinho's obvious interest in the player, there is nothing to suggest that Bale will become a United player any time soon. Not that that will stop United fans everywhere salivating at the prospect.