Robben is expecting a tough match against his former side in the first leg at the Allianz Arena and is wary of the sheer firepower the Bavarians will be up against.
He told Marca: "We will give everything. You will see a great Bayern, I'm sure. We have no doubt that to eliminate Madrid, we will have to be at 120 per cent, at our maximum, and play the perfect game."
"There are no secrets to Madrid. Their enormous potential is clear, but the most important things is that they have the best coach, who always knows how to play these games.
"They have incredible quality in attack. You can't give them a metre [of space]. You have to watch them closely the whole time."
Robben insists that he is fully focused on his current career at Bayern despite a previous good spell at the Santiago Bernabeu.
"I had some very good years at Madrid. It's a great club, and it's obviously special to face my old team-mates, but I have been at Bayern for a while now and I am happy here. I am thinking above all about getting to the final, whoever the rival is."