Italian agent Beppe Bozzo expects Marcelo to stay with Real Madrid.
The Brazil wing-back has battled to win over new Real coach Julen Lopetegui this season and been linked with a January move to Juventus.
Marcelo's friendship with Cristiano Ronaldo has added to the speculation.
But Bozzo told Calciomercato.com: "I think it will be very difficult for a Real Madrid player to leave the club to join Juventus.
"So I do not think that Operation Marcelo can end in favor of Juventus."