The Hoops were comfortably beaten at Old Trafford on Sunday as they slumped to their third Premier League defeat of the season.
Despite being humiliated by United, Redknapp is confident that his players will improve in the coming weeks.
"These aren't the games that will shape our season," the 67-year-old told the club's official website. "We've got to be better and I think we will improve."
QPR continue their Premier League campaign on Saturday when they welcome Stoke City to Loftus Road.