The former Manchester United player has brushed aside speculation that his compatriot will leave then Spanish capital club at the end of the campaign and head back to England
It was reported in January that the Portuguese trainer had already decided to leave the club at the end of the current campaign in order to return to England, with both Chelsea and Tottenham Hotspur touted as potential destinations for the 49-year-old.
However, with Los Blancos currently ten points clear at the top of La Liga, Ronaldo is steadfast in his belief that his compatriot will remain in Madrid.
"Mourinho will stay with us, I'm sure," the attacker told reporters ahead of Wednesday night's Champions League clash with CSKA Moscow.
Ronaldo added that even if he or his coach did depart, Los Blancos would not collapse and also had a word on the second leg of the club's round of 16 tie in the Champions League against CSKA.
"Real Madrid are the most important thing - not me or Mourinho," he argued.
"We're doing well, [but] we know that tomorrow [Wednesday] we have a very difficult game," the 27-year-old concluded.
Real Madrid only have an away-goal advantage coming into the second leg of the tie against CSKA in the Champions League after a 1-1 draw in Russia in the first game.
How do you stay up to date with football when on the move? With http://m.goal.com – your best source for mobile coverage of the beautiful game.