Ronaldo recently admitted that he misses Manchester United manager Sir Alex Ferguson, describing the 70-year-old as his "father in football".
But, the 27-year-old hailed Mourinho’s similar work ethic to his own as key to his superior fondness as Los Blancos prepare to take on Premier League champions Manchester City in the Champions League.
“Jose is the world’s best coach, he’s No .1,” Ronaldo told reporters.
“It’s so great to work with him because I’m a person who likes to win, compete - and who hates losing!”
AT THE DOUBLE?
Cristiano Ronaldo is 7/4 to score two or more goals against Manchester City with William Hil
Ronaldo, who left United for the La Liga champions in 2009 in an £80 million deal, revealed how desperate Madrid are to boost to their trophy haul and, personally, how focused he is on adding another European medal to the one obtained with the Red Devils in 2008.
“Everything is focused on winning the Champions League,” he added.
“You can feel it everywhere, even in the street because everyone knows we’re close to winning the club’s 10th European Cup.
“It’s my dream to win the Champions League again too. It’ll come this year or next year but we have to stay calm.”