The tennis player says los Blancos will not be short of hunger at the Santiago Bernabeu in the Champions League semi-final
After a 4-1 defeat in the first-leg of their Champions League semi-final in Germany last week, los Blancos will need every ounce of energy and support to triumph in the second leg.
And fresh from winning the Barcelona Open title, the tennis player is desperate for Madrid to cap off a perfect week by booking their place in the final at Wembley.
"There is no motivation better than to play at the Bernabeu for a place in the Champions League final," the Spaniard told Marca.
"Madrid is going to make the effort. Let's hope for a good start and then I believe it can happen."
Iker Casillas has been left out of coach Jose Mourinho's plans this season but the Madrid fan refused to comment on the matter.
"I am not somebody who can comment on this topic. Everybody else can say what they like."
Rafael Nadal's father, Miguel Nadal, was a professional footballer who played for Mallorca and Barcelona. He won five Liga titles and one European Cup with the Blaugrana.