Redknapp does not believes United will manage to go through the Premier League season unbeaten.
He 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.
“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.”
He added on their draw: “What it does to me is show we are not a million miles behind the other teams. We played United close, we battered Man City here first game of the season and drew.
“We have to believe we are not inferior to anyone. We are getting closer and closer.
“The top five teams are getting closer and closer. We are outsiders, but the favourites will be Man United still.”