Casemiro penned new terms with Real Madrid yesterday.
The Brazilian midfielder signed with Real to 2021.
"This is a special day; I am the happiest person in the world - today and all the days in which I am a Real Madrid player," he said.
"I'm staying here and my dream is intact. I'm as excited as ever and hope to pay the fans' support back in the training sessions and in the games, as I have done up to now.
"I want to take full advantage of this opportunity by working very hard every day. I am sure that I will fight hard for a place in the Real Madrid team and repay everyone for the affection they give me. I want to triumph at Real Madrid."