Unbeaten in 11 Premier League games, Chelsea – with four Brazilians in their squad – are four points clear at the top.
Oscar and Willian have both been regular starters under Mourinho this season and Ronaldo believes the pair can only improve under his guidance.
"I think it's definitely the right teams for them to be at because of the nature of the English football league, which has a lot of goals, a lot of attacking play," the former Real Madrid striker told reporters.
"The players under Mourinho's coaching, they have a lot of potential because of the nature of him as a coach. So overall, it's definitely a good decision for these young talents to be in the Premier League."
Ronaldo, a two-time World Cup winner who scored 62 international goals, also revealed he is still hurting from Brazil's 7-1 semi-final loss to Germany in last summer's semi-final on home turf.
"The semi-final was a weird match," he added. "It was painful, those five crazy minutes that broke the game and of course, it was quite sad.
"But overall, I'm happy with the World Cup went and very proud."