Borussia Dortmund boss Jurgen Klopp will play an ultra-defensive game against Bayern Munich's strike force, ahead of Saturday's Bundesliga clash. Bayern are uncommonly playing with three forwards after they signed Dutch ace Arjen Robben from Real Madrid, and Klopp admitted his concern with his opponents' strategy. "You don't have that every week. We'll have to think of something. In principle, you can't give them ... much space, otherwise they are very strong," Klopp said. "We are going to defend with everything we have." Mohamed Zidan's Dortmund will be looking to enhance their Bundesliga position as they lie 12th with just five points from four games. Bayern, on the other hand, are in no better position as they also have five points but lie eighth on goal difference.