Rangers go into their clash with United on Saturday still anchored to the bottom of the Premier League table and seven points from safety.
They face the league leaders at Loftus Road, with Redknapp using recent examples of a victory over west London rivals Chelsea and a draw over previous employers Tottenham as proof they can pull off a shock win against the Red Devils. "You can't predict results," Redknapp told the Fulham Chronicle.
"We're playing Chelsea away on the back of being smashed to pieces by Liverpool. What's the score going to be you might ask? 3-0, and 4-0 to them? I was surprised as you were.
"We then play Tottenham at home who've beaten everybody away and have scored in all away games - and they don't score against us."
With other decent results picked up in the hunt for Premier League survival, Redknapp is certain QPR will be able to take all three points from Sir Alex Ferguson's side.
"Against Man City who are champions, we get another great point and then another at West Ham, which is a hard place to go," he said.
"So we're just as capable of getting something against Man U as anyone else."
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