The Brazilian spoke highly of his former manager, who left the club following three consecutive Champions League titles
Marcelo says he "gave everything" for Zinedine Zidane, who he says got the best out of him during his time at Real Madrid.
The Brazilian won three Champions League titles under the French manager, who departed the club this past summer.
Zidane remains unemployed at the moment, while his successor, Julen Lopetegui, was dismissed shortly after taking the job and replaced by Santiago Solari.
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Marcelo has found more competition than in years past with the rise of Sergio Reguilon.