UOL Esporte says Ronaldo is looking for the two full-backs, who would give the club a publicity boost as well as offering something on the pitch.
The same source report that the salaries are not a problem for the team. Even still, it won't be an easy task to bring either to the club.
Both are looking to reach Qatar 2022 and play for Brazil.
After ending his 16-year spell with Real Madrid and becoming the player with the most titles won with the club, Marcelo is already being sought after by several teams across Europe, among them AC Milan, who want to strengthen their squad after winning the Serie A title and ahead of their participation in the Champions League next season.
While Alves, who left Barcelona after a second spell with the Blaugrana, is also wanted by several teams, including Brazil's Flamengo, who are looking to bring the full-back home and sign him for at least one season.