The Portuguese sensation has netted 62 goals in 2013 already has 24 this season, although a lack of silverware with Madrid in 2012-13 could hamper his chances of lifting the prestigious individual prize for the first time since 2008.
Roberto Carlos, however, insists there is no-one more deserving of the prize than the 28-year-old attacking star.
"Cristiano Ronaldo deserves the Ballon d'Or," he told teinteresa.es. "And I think this year he is going to get it.
"What Ronaldo is doing, in getting goals so regularly, should be rewarded. I think he’s going to win."
Roberto Carlos went on to lavish praise on Ronaldo's new team-mate Gareth Bale and backed the Welshman to become a global star at Santiago Bernabeu.
"Bale is one of the best in the world. He proved that in England and has already started doing some great things at Real Madrid," said the Brazilian.
"I'm sure he's going to be one of the best. He's also young and has room for even more improvement."
Finally, the Sivasspor boss believes Carlo Ancelotti's side will reclaim the Liga title from Barcelona this season if they continue to build on their recent strong form.
"If Madrid play to their best, which they are beginning to do, then I think they will win the League," he added.
"They have a good squad with new, young players, and others with more experience. I think the project looks great."