The defender cast his prediction that his compatriot would soon renew at the capital outfit and rates him more highly than counterpart Lionel Messi.
Ronaldo's contractual situation at Madrid has hogged the airwaves this summer as speculation grows he would accept a move back to former club Manchester United. But Carvalho, who recently signed for Monaco, has backed the los Blancos icon to put pen to paper on a deal to extend his stay at the Santiago Bernabeu beyond 2015.
"Every player who has quit Real Madrid will have regretted it later," the 35-year-old told A Bola. "Cristiano will renew his contract. Cristiano is a winner, he always wants to play and win and that’s why I am in no doubt that he will continue with Madrid."
Carvalho also waged into the debate over whether Ronaldo is a better soccer player than Barcelona star Lionel Messi and, as a compatriot and a former teammate, the Portuguese defender rates the Madrid attacker higher.
"Cristiano is a more complete player than Messi and I am not just saying that because I am Portuguese. Looking at it objectively, it’s what I think," he said.
Asked about want-away Madrid full-back Fabio Coentrao's status, Carvalho replied: "I think that he wants to move on because he thinks that it would be the best thing for him to do for his career.
"Personally, I think he should continue because he meets Madrid’s requirements. He played well in practically every game last season. He’s a great leftback, to the point where he even made a few of his critics change their opinion about him. I do think that he has a place at Real Madrid."