Real Madrid legend Iker Casillas has backed Cristiano Ronaldo after he was booed at the Santiago Bernabeu on Sunday.
The former Los Blancos goalkeeper, who also experienced boos during his time at the club, has stated that the criticism from the stands is something many players go through.
However, he insists that jeering Ronaldo is 'madness' considering how superb he has been playing in recent years.
"These things happen in stages, Cristiano sells a lot, and demands a lot of himself," Casillas told Onda Cero's "El Transistor" show. "Along with [Leo] Messi he is the best in the world — he has this … this responsibility.
"As a Madridista, sometimes you don't understand why it can happen. Six months ago Madrid were European champions, one month ago they were world champions. He has just won the trophy as the world's best player.
"Last year I remember a difficult moment before [Rafa] Benitez left. Then at the end of the season they were in the clouds with the Champions League.
"If he scores two or three goals a game, that is just what he is supposed to do. It is madness. You must help him — have people around him and the club who help to protect the players. He must continue trying to be the player he is, the best in the world."