Borussia Dortmund manager Jurgen Klopp has admitted that his side must not allow Real Madrid to finish their quarter-final in the first leg on Wednesday night.

Klopp's side knocked out Real at the semi-final stage last season, but Klopp is worried that Carlo Ancelotti's men will be able to build a convincing lead at the Santiago Bernabeu before the second match in Dortmund.

"Playing the second leg at home may be a slight advantage but I fear Madrid trying to settle the tie here," the German told reporters. "I have seen many of their games and they never finish a match without one scoring opportunity.

"They have incredible quality and we can't ignore that. If we play our game and keep our heads up, we will have chances."

Ancelotti has confirmed that top scorer Cristiano Ronaldo is fully fit for the meeting with Dortmund.