Ronaldo joined Real Madrid in a world-record £80million move from Manchester United in July 2009.
Anzhi Makhachkala signed Samuel Eto’o from Inter Milan over the summer and the Cameroon star is currently earning around £17.9million a year after tax in Russia.
When asked if he could make a similar move, Ronaldo told Sportbox.ru: “Do you ask if I want to play in Russia when I’m over 30 ? Why not? I know that Russian football and the league gets stronger. I don’t have anything against it to play in your country.
“In football you never know what happens to you the next day, so no-one should be surprised if I one day move to Russia.
“But apart from this I’m very satisfied with Real at the moment.”
