His comments come on the back of reports at the weekend in Brazil which suggested that Barca were favourites to land the highly rated 19-year-old.
Ronaldo, who played for the Catalans from 1996 to 1997 and Madrid from 2002 to 2006, added his weight into the argument by declaring the Bernabeu as the ideal place for Neymar to kick-off his European football adventure.
"Both options are great, but I still hope he goes to Real Madrid, where I spent five years," Ronaldo told Terra.
"I think it would be better for him.
"Brazil has become too small for Neymar.
"This is his moment and he needs to have the ambition to conquer the world, rather than just be the best in Brazil."
Neymar was linked with a big money move to a whole host of European clubs in the summer including Barca, Madrid and Barclays Premier League side Chelsea. However, the Brazil international opted to stay at Santos to fulfill his goal of representing the Brazilian side at the FIFA Club World Cup in December.
Santos qualified for the competition after winning the 2011 Copa Libertadores.