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United went back to the top of the Premier League and kept their unbeaten league record intact following a goalless draw against Tottenham at White Hart Lane in which United full-back Rafael was sent off.
But after a match of few clear-cut chances Redknapp said: "I couldn't say they (United) are on another level and are going to walk away with the title. I can't see them going the year unbeaten. There are lots of teams who could beat them on any given day."
He added: "You can't be as good a team as you were a year or two ago when you had (Cristiano) Ronaldo and (Carlos)Tevez. I think other teams have improved and got closer to them, but at the moment they are still top of the pile after losing players like that."
Redknapp admitted Rafael's sending off, for a foul on Benoit Assou-Ekotto in the second half after receiving a yellow in the first, was harsh.
He said: "He's just run in and clipped his (Assou-Ekotto's) heels. He hasn't stuck his leg out. It was Mary Decker and Zola Budd wasn't it? What can you do about that? He hasn't broken his stride."
Sir Alex Ferguson, however, refused to comment on the sending off by referee Mike Dean.
Ferguson said: "I'm not going to discuss it. It's not worth discussing because everyone can see that. It's out of my bounds."
The United manager preferred to concentrate on the form of his defence which was back to its best with Rio Ferdinand and Nemanja Vidic back in harness.
Ferguson said: "We defended very well, they never gave us any trouble with their attacking. We had one or two good opportunities at times when we got to the last third of the field but we just didn't quite have the cutting edge."
Source: PA
Source: PA