The 27-year-old, who originally bought the Porsche 911 convertible in 2007 and sold it a year later, has had the vehicle valued at £37,995 at Mole Valley Specialist Cars in Capel.
"We have had lots of phone calls about it but nothing more than that just yet," director of Mole Valley Specialist Cars Chris Chadwick said. "But we aren't worried about selling it at all, because it's a beautiful car and it has that added star value.
"The last owner was a doctor up North and before that it was Ronaldo. You can see his name and former address on the logbook, which is very exciting. It is priced for what it is, not because one of the best footballers in the world owned it. Although I have to say that he kept it in amazing condition."
Ronaldo sold the car after securing an £80m-move to Madrid from Manchester United.