Calderon told El Confidencial: "I know that the relationship between Pérez and Zidane is very, very tense.
"Pérez did not bring him what he wanted and did not sell the requested players. This tension is felt on the players and results in injuries and defeats.
"How is it possible that €60m was paid for (Luka) Jovic and that (Alvaro) Morata is at Atlético? Or that Mario Hermoso, the next central defender of the national team, is at Atlético, and that Real signed (Eder) Militao, who does not even play?"