Ronaldo has been training with Brazilian side Flamengo recently, in a bid to return to full fitness from a knee injury.
The 32-year-old admits he could join City, but admits he could also join Flamengo and Paris St Germain.
“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.”