The Bavarian giants will play host on Saturday when the two sides confront each other in Munich in the Bundesliga.
"We simply need to continue steadfastly on our way," Rummenigge told Bayern's official website.
"We mustn't let up, we mustn't look over our shoulders, and we mustn't look from side to side.
"We have to keep looking forward, with total concentration and great determination."
Bayern will head into the game 15 points clear at the top of the Bundesliga.