Real Madrid boss Carlo Ancelotti says Iker Casillas needs to make a decision about his future. Casillas was jeered by fans on Saturday against Valencia.
Ancelotti said: "Casillas has a lot of experience and this isn't going to affect him, but rather motivate him more.
"There are times that I understand whistling when you don't play well or make mistakes, but there are times that it's incomprehensible. I think that tomorrow will be different, because the Bernabéu understands the importance that this game has.
"It's up to everyone to make their own future decisions. I think that Casillas has said many times that he wants to stay. He has the confidence of the coach, of his team-mates in the dressing room and of the club."