The Brazil international has dismissed suggestions that his relationship with the Portuguese has turned sour.
A number of recent reports have suggested that the Brazil international did not get along with the Portugal international, but Marcelo has now made it clear that there is no tension between the two players.
"I do not have a problem with Cristiano. These rumors are wrong. I never had any problems with him," the left back said when asked about his relationship with the Portugal star at a news conference. "People are creating things that are not there. If anything, I have an excellent relationship with Cristiano.
"Who should win the Ballon d'Or? Cristiano Ronaldo. He deserves to win it, not just based on his performances this season, but also for all the hard work he always puts in."
Marcelo went on to discuss Wednesday's Champions League match against Galatasaray and insisted that Madrid wants the full three points in order to seal the top spot in its section.
"It's very important to us to finish first in the group, not just for the round of 16 draw, but also for our confidence," he said. "We are in a good mood. We're strong in attack and have improved defensively."
Madrid has collected 10 points from four games so far in Group B and will be guaranteed Champions League football after Christmas with a draw on Wednesday.