The Spanish club's former president insists the World Cup winner faces a difficult task following Rafa Benitez's sacking after just seven months in charge
Zidane replaced Benitez, who was sacked after just seven months in charge, on Monday, but Calderon insists the World Cup winner was not Florentino Perez’s first-choice replacement.
"I wish Zidane all the best but I'm sure it's going to be very difficult,” Calderon told BBC 5Live.
“He is not the one that the president [Perez] wanted.
"He was trying to sign Mourinho and he didn't want Zidane. That is the truth. I don't know if he [Zidane] will be successful but if he is not, Mourinho will be on the bench in June."