The Real Madrid coach said earlier this week that no team in world football would be able to finish above them and Barca in La Liga.
Madrid forward Ronaldo has now given his support to the Portuguese, while claiming that Mourinho is the best coach on the planet.
"Any team in the world would be third in Spain," the 27-year-old told ESPN.
"I feel very happy at Real Madrid because here we always have high aims. I train with the best coach and top players in the world."
Ronaldo is currently with the Madrid squad on their pre-season tour of the US.