The Warriors are just a point behind leaders Huddersfield after winning their last three matches but assistant coach Harris is wary of the threat posed by the Rhinos following their 32-8 home defeat by the Giants last Friday.
"Going to Headingley is always a difficult place to go. We know they have some great individual players and, although they weren't great last week, we expect them to come with their A game and we will need ours as well," said Harris.
"They are certain to come at us with all guns blazing. Headingley is a noisy place and we need to produce a performance that quietens the crowd."
Wigan stunned the Headingley faithful last June with a 50-8 victory, although Leeds went on to gain their revenge in the semi-finals of both the Challenge Cup and play-offs.
"Wigan are a quality side who pose any number of threats," said Rhinos coach Brian McDermott.
"We had some great battles last season when they got the better of us in the league, including a tough defeat here at Headingley, whilst we held sway in the knockout games."