Cristiano Ronaldo believes Real Madrid have a good chance of beating La Liga leaders Barcelona at the Santiago Bernabeu on Wednesday.

The old rivals will meet in the first leg of their Copa del Rey semi-final and Ronaldo is confident Los Blancos can pull off a win, even though he admits it will be tough.

"We will be at home, in our stadium which is a good opportunity for us to take an advantage in the tie," he told AS.com. 

"It's a really important game, a difficult game. We will be up against one of the toughest teams in the world so it will be a great night.

"We are missing a few key players - players who are important to us but that shouldn't be an excuse. We need to put in a good game because Barca are an amazing team."

Commenting on Real's 4-0 win over Getafe on Sunday, Ronaldo added: "We were a little sleepy to start because we are not used to getting up so early to play. We were a little slow in the first half and we didn't play that well," he said.

"The coach's half-time advice helped us and we did a good job in the second half. We scored four goals and that is important for team moral and we're ready for the games we have coming up."