The Real Madrid manager retains full confidence in his first-choice goalkeeper, ruling out any potential summer departure.
Having practically conceded the title race at the weekend, with a 2-2 draw against Valencia at the weekend, with just two games remaining and four points behind Barcelona, this wasn't going to be the easiest of press calls for Carlo Ancelotti.
During the match against Valencia, Iker Casillas reacted angrily to whistles from the Bernabeu crowd, critical of his performance and the two goals conceded.
Asked about the whistles from the fans, aimed at the Real Madrid goalkeeper, Ancelotti responded: "Every manager feels it when one of his players is whistled, but Casillas has experience and is used to it. This won't affect him - it will motivate him."
According to Cadena COPE radio, the Spanish captain frustratedly responded to fans behind his goal: "That's enough already... go stick it up your arse!"
Questioned for his thoughts about such a reaction from the 33-year-old, Ancelotti neither backed the stance of his player, or criticised it, simply suggesting: "Everyone should think about the decisions they make."
Needless to say and given the frustrations of Casillas, the rumour mill has linked the goalkeeping star with a move away from the Bernabeu this summer. British tabloid Metro claimed he wants a move to Arsenal, whilst Gunners star and international colleague, Santi Cazorla, has also offered his thoughts on such a move.
However, as far as Ancelotti is concerned, Casillas is going absolutely nowhere, insisting: "He's said he wants to stay here. He has the utmost confidence of his manager, his team-mates and the club. He's a guarantee."
Casillas hasn't been the only player to feel the frustrations of Real Madrid fans, during the course of the season. Cristiano Ronaldo has also reacted poorly to criticism and whistles from the crowd.
Ancelotti explained: "Sometimes I can understand the whistled, because we make mistakes, but other times, I don't understand them at all. Iker and Cristiano are okay with them, though."
Confident there'll be more praise and support from the fans, on Wednesday night at the Bernabeu against Juventus, the Italian coach concluded with confidence: "It will be different. The fans know how important this is. The Madrid support will be united as one."