Barcelona goalkeeper Victor Valdes has said that Real Madrid goalkeeper Iker Casillas is one of the best in the world.
The duo, who were both part of the Spain squad that lifted the World Cup last summer, will be pitted against each other in the Primera Liga at the Bernabeu on Saturday.
Valdes was the third-choice keeper behind No.1 and captain Casillas in South Africa, while Liverpool's Pepe Reina took the number two spot.
