He told liverpoolfc.tv: "Pepe is one of the best goalkeepers in the world.
"If you analyse his game, his technique is really good. He is also very good physically and mentally he is very strong.
"So, if you take all that into account you have to say he is a very good keeper. For me he is the best keeper in Spain. There are many good keepers in Spain - Casillas, Valdes and so on - but Pepe has everything.
"But he can still get better. He is training well and he knows there are two or three things that he needs to improve. Every player can be better."