Giroud scored his 16th goal of the season against the Royals and is hoping his team-mates can continue with their recent consistent form.
"Yes, we are playing well," he told arsenal.com. "We succeed to score lots of goals.
"We need to be more concentrated when we are defending, because we need more clean sheets because we dominate the games. We want to be ambitious and keep our focus.
"We want to dictate the games. We are confident. We are used to finishing the Premier League season well. And again this season we will do the same."