Queensland Origin legend Kevin Walters says he expects a clean rap sheet for both the Maroons and the Blues in State of Origin III.

Games one and two were marred by incidents involving NSW stars Paul Gallen and Trent Merrin and Queensland fullback Billy Slater.

But Walters allayed fears the players will again fire up in next Wednesday's series decider, telling the SportsFan Clubhouse that the players know there are more effective ways to damage an opponent than by resorting to blows.

"There's always a lot of emotion in these sorts of games but I don't think it'll come to punches," Walters told the gang.

Visit SportsFan to hear the entire interview.