"We need to change things around, we know that," Redknapp told the club's official website. "We need to bring in new faces.
"We're trying to do one or two things, we're still looking, but it takes time. You have to make sure you get the right ones as it's important to bring the right people into the club.
"There's not an awful lot of movement at this time but I'm sure things will warm up."
QPR start their push for promotion back to the Premier League at home to Sheffield Wednesday on August 3.