Ronaldo signed a 2-1/2 year contract estimated by media to be worth more than 200 million euros ($220.16 million) with Al Nassr, making his debut in January.
He scored 14 goals in 16 games but it was not enough to help his side win the Saudi Pro League (SPL) title, with Al Nassr finishing second behind Al Ittihad.
"We have very good teams, very good Arab players, but the infrastructure - they need to improve a little bit more.
Since Ronaldo's arrival, several other top players have been linked with a move to the Saudi league, with Lionel Messi receiving a formal offer to join Al-Hilal next season.
"If they are coming, big players and big names, young players, 'old players', they are very welcome," said Ronaldo.
Persons:
Cristiano Ronaldo, Nassr, Ronaldo, Al Nassr, Lionel Messi, Ronaldo's, Ballon, Karim Benzema, Rohith Nair, Peter Rutherford
Organizations:
Saudi Pro League, Al, Manchester United, Juventus, Real Madrid, Saudi, Thomson
Locations:
Portuguese, Saudi Arabia, Al Ittihad, Europe, Hilal, Bengaluru