He told Real Madrid TV: "When I heard the club was interested in me I was very excited. It was a big step for me. I spent six perfect years at Chelsea. Then, to come to the greatest club in the world was fantastic. I'm so proud to be here and to play for Real Madrid.
"He works on every single detail and very well on a daily basis. He wants you to improve every day. It's only normal that you grow as a player, and also as a man, when you work with him. I'm very proud of working with him for such a long time. It's special to be next to him.
"He wants to do well every day. He works hard to improve daily. You can't afford to make mistakes. He says, "No, you can't make mistakes. You have to focus on your game at all times and train to be better." All players that work with him can improve, provided they listen and train well."