But the 31-year-old is adamant all that could change at Euro 2016.
"European Championships and World Cups are always special competitions," said Ronaldo, who overtook Floyd Mayweather Jr as the world's highest paid athlete.
"The final stages are always beautiful moments, unforgettable moments in a player's career, so this will be another European Championship on my CV.
“Obviously I'm happy about it and I also feel privileged to have been able to participate in many final tournaments.
"And evidently it's a delicate moment, a special moment because anything can happen. I think Portugal are in a good run of form, we had a very positive qualification."
Players who have scored at three European Championships:
Nuno Gomes (Portugal)
2000 v England, Turkey (2), France
2004 v Spain
2008 v Germany
Thierry Henry (France)
2000 v Denmark, Czech Republic, Portugal
2004 v Switzerland (2)
2008 v Netherlands
Zlatan Ibrahimovic (Sweden)
2004 v Bulgaria, Italy
2008 v Greece, Spain
2012 v Ukraine, France
Jürgen Klinsmann (Germany)
1988 v Denmark
1992 v Netherlands
1996 v Russia (2), Croatia
Hélder Postiga (Portugal)
2004 v England
2008 v Germany
2012 v Denmark
Cristiano Ronaldo (Portugal)
2004 v Greece, Netherlands
2008 v Czech Republic
2012 v Netherlands (2), Czech Republic
Vladimír Šmicer (Czech Republic)
1996 v Russia
2000 v Denmark (2)
2004 v Netherlands
Sportsbeat 2016
Source: Sportsbeat