Real Madrid midfielder Sami Khedira knows Cristiano Ronaldo will be vital in the return-leg of their Champions League semifinal against Borussia Dortmund.

Real must overcome a 4-1 deficit and are sweating on Ronaldo recovering from a thigh injury.

Khedira said: "Everyone who knows him realizes that he is always geared up for every game, no matter if it is a decisive one or a game where there isn't much at stake. He is a great professional, like all his team-mates, but we are going to need him and his goals more than ever on Tuesday. We all hope we can put in a good team performance."