The Portuguese believes that los Blancos are in good form going into their mammoth derby clash and feels that victory is theirs for the taking
Los Blancos have the benefit of home advantage for the tournament decider, as well as a remarkable record against their city rivals, whom they have not been beaten by in any competition since 1999.
Ronaldo also believes that in spite of their recent elimination by Borussia Dortmund at the semi-final stage of the Champions League, Jose Mourinho's men are in fine fettle going into this most important of Madrid derbies.
"We're very excited about this trophy and we want to win," the forward told his club's official website. "We know it's going to be a really hard-fought game against a rival from the same city. It's going to be a great show.
"Let's hope that Real Madrid can win. But if we go out on the pitch strong and we play as we know how, we're going to win."
However, Ronaldo also believes that Madrid's fans have a massive part to play in Friday's final, given that they will not be in the majority for once.
Consequently, the former Manchester United winger is hoping that the club's supporters will try to replicate the passion they display before and during their recent semi-final, second-leg clash with Dortmund.
"It was amazing," he enthused. "As long as I've been here I have never seen a reception like that. It was a really special, unique moment that none of us players will ever forget.
"I hope that the same happens on Friday because it motivates us to give our all when we hit the playing field. That's what we want.
"It's going to be a strange final because we're playing in our stadium but the fans will be divided 50/50.
"But that isn't going to take away our ambition to win this cup."
The Copa del Rey final is scheduled to kick off at 21:30CET.