The Royals were on the wrong end of a remarkable 7-5 scoreline against Arsenal on Tuesday evening but Leigertwood believes that result will not affect the team when they travel to Loftus Road.
"Arsenal are a good side and if we don't do the stuff that we're good at, then we'll get punished — unfortunately that was the case in the second half," admitted Leigertwood. "The QPR match will be a test but we've shown time and time again that we can bounce back.
"There's no reason why we can't go and get a positive result on Sunday.
"They've spent a lot of money over the summer but things aren't clicking for them. But we're not worried about them — we focus on ourselves."
Neither Reading nor QPR have won in the Premier League this season.