The Portuguese recently said that he should have signed Diego Lopez earlier this season than in January.
"We have to have a bit more respect for Iker," he told Canal+. "The boss's quotes were not the most suitable.
"Iker is an institution - at this club and in Spain. He has to know that we [the players] and the fans are behind him."
Lopez has established himself as Madrid's first-choice goalkeeper since his arrival from Sevilla in January.