The Blancos supremo insists that he has nothing but respect for the Spain international goalkeeper, while also revealing that he remains on good terms with Jose Mourinho
It has been reported that the Blancos supremo believes that the Spain international, who has been forced to play second fiddle to Diego Lopez since the middle of last season, is being advised poorly at the moment.
However, Perez insists that he continues to hold the World Cup winner in the highest esteem.
"It's not true that I am annoyed with Casillas," the 66-year-old Madrid native told Jugones. "He has my gratitude and affection. He is the best goalkeeper in the history of Real Madrid and Spain.
"We all have people around us that can sometimes not be beneficial, not just him."
Meanwhile, Perez stated that he remains on good terms with former boss Jose Mourinho, who left the Santiago Bernabeu during the summer to return to Chelsea.
"I have not spoken to Mourinho since I saw in Miami, but I wish him well," he said. "He helped us to make a qualitative leap. I am grateful to him."
Madrid won the Liga title in 2012, Mourinho's second season in charge, but they finished 15 points behind Barcelona last term.