Ronaldo has urged Manchester City to make him an offer. City were interested in the former Real Madrid and AC Milan striker before they were taken over by the Abu Dhabi Group.
Ronaldo, 32, is nearing full fitness after a serious knee injury.
He said: "I've been approached by many clubs but if City make their offer again, I'll consider it.
"I'm strong and I believe in one or two months I'll be playing at 100 per cent."