Former Real Madrid star Iker Casillas is unhappy that Keylor Navas has been jeered at Santiago Bernabeu, believing him to be one of the best goalkeepers in the world.

"What can I say? I don't like the jeers towards Navas," Casillas told Marca.

"I experienced it and you have to have a lot of courage to forget about it. It is a demanding club.

"The whistles have settled at the Bernabeu and it's curious because, in Keylor Navas' case, watching his performance last season, it seems incredible to me that he is not among the top two or three goalkeepers in the world.

"With what Keylor did last year, winning the most important competition in Europe at club level - which neither UEFA nor FIFA have recognised - I do not say he is the best, but at least the second."