The veteran wing-back is being linked with a switch to Turin.
Calderon told TuttoJuve: "I have a great weakness for Marcelo, because he was one of the players I bet on as part of my sports project when we bought him in December 2006.
“He was only 18 years old, he was very young. I am very happy for the success he had, after 13 seasons he remains one of the most important players of the team.
“I think he could still play at a good level for another 3 or 4 years, so in the event of a transfer Real would lose a top player while Juventus would make a really good deal."