Cristiano, 32, has threatened to quit the club after feeling disillusioned over a perceived lack of support over his tax scandal.
But the Brazilian Ronaldo is adamant that the former Manchester United star is going nowhere.
“I’m almost certain that Cristiano Ronaldo will stay at Real Madrid,” he told Gazzetta dello Sport.
“A player who scores 50 goals every year is too reliable to be let go.
“[The top players] are the ones who can decide [their futures], but I don’t think there is another club able to treat him better than Real Madrid, although I don’t know his reasons for feeling upset.”
Real president Florentino Perez shares a similar view and is planning for Ronaldo to stay.
Perez told esRadio: “I know Cristiano is angry, but I think he will stay.
“I haven’t spoken with him. The only thing that has to be done is to wait and talk after the Confederations [Cup].
“I have spoken with Mendes about him. No need to worry more than [is needed].”
Ronaldo has been linked with a move to Manchester United but Express Sport understands he won’t be returning to Old Trafford.
While the club have, in the past, shown an interest in the Portuguese superstar, he is not on a list of current transfer targets.