Jo believes Ronaldo still has 'a lot to offer', but is unsure if his fellow Brazilian will join him at Manchester City.
Ronaldo is currently working his way towards full fitness from a knee injury and has been training with Flamengo in his homeland.
The experienced striker admits joining Flamengo is an option, while a move to Paris St Germain also holds appeal for the former Real Madrid ace.
Cash-rich City have been linked with a bid and, despite the club recently playing down talk of an offer for Ronaldo, the 32-year-old says the Premier League is still a possibility.
Summer signing Jo is a big fan of Ronaldo and the City striker is confident that his compatriot's career at the highest level is not over.
"He's a player I grew up admiring," Jo told ZOO magazine.
"For me, he's the finest striker of the last 10 years, along with Andriy Shevchenko and Raul.
"To be the highest-ever scorer in the World Cup explains everything there is about him.
"Will he come to Manchester? I don't know. But I still believe he has a lot to offer when he gets back to full fitness."
Read the full article in ZOO magazine, out now