Ronaldo signed for Al-Nassr in December after leaving Manchester United and scored 14 goals in 16 games as his side finished second on the table.
The 38-year-old has a contract with Al Nassr until 2025.
In recent days, the likes of Karim Benzema, Lionel Messi and Luka Modric have been linked with moves to Saudi Arabia in the twilight of their careers.
Ronaldo is convinced the Saudi top flight has the potential to become a top five league in the coming years and wants the best players to come over.
"If they are coming, big players and big names, young players, 'old players', they are very welcome because if that happens, the league will improve a little bit," Ronaldo said in an interview with the SPL.
"The league is very good but I think we have many opportunities to still grow. The league is competitive. We have very good teams, very good Arab players.
"But they need to improve a little bit more the infrastructure. Even the referees, the VAR system, should be a little quicker."
"I think other small things they need to improve," added Ronaldo, who holds the records for most international goals and appearances.
"But I am happy here, I want to continue here, I will continue here. And in my opinion if they continue to do the work that they want to do here, for the next five years, I think the Saudi league can be a top five league in the world."
