The Spaniard came through the midweek Champions League clash against Real Madrid in good order from his troublesome ankle injury and looks set to take his place in the starting line-up at Old Trafford.
"The pain was not important. I have three days until the game with Manchester United and I think I will be fit," he said.
"After the first goal it was very difficult for them to score two and the penalty sealed the game.
"The plan was to play with intensity and a high tempo. Iker Casillas is one of the best goalkeepers in the world and every game I have played against him he has been brilliant.
"But I think we played well, we prepared for the game better than them and the goals were brilliant.
"We showed that from the first minute. And Stevie (Gerrard) makes me more happy when he is playing, and he had a fantastic game.
"We have confidence now for the Champions League and a massive game against Manchester United at the weekend.
"I hope to win that too. We know it is important to win there because if we do not Manchester United will strengthen the advantage they have over us."