Torres told liverpoolfc.tv: "They have a fantastic 'keeper - one of the best in the world. Every time I play against him he is brilliant. The best Real Madrid player on the night was Casillas."
"We have to wait for the draw, but we have confidence now for the Champions League, and also for Saturday against United," added Torres.
"That is a massive game. I hope to win that and have more chances in the league. We know it's very important to win there - if not they will be many points ahead."
On his own fitness, the number nine said: "I feel good. My ankle felt a little bit painful in the second half but that doesn't matter in a match like this. We will work hard from Wednesday morning and I think I will be 100 per cent for Saturday."