Internazionale supremo Massimo Moratti has refused to rule out the possibility that Ronaldo could be back at Giuseppe Meazza next season.
The Brazilian star is currently under severe scrutiny at the World Cup after two disappointing performances in Brazil's group games, and has been linked with an exit from Real Madrid after a long hard season at Santiago Bernabeu.
Ronaldo criticised the club's fans back in February, a decision which led to fevered speculation over his future, and a likely destination should he leave Los Merengues would be Inter.
The former Barcelona and PSV Eindhoven striker was a hit at the Serie A side before serious knee injuries curtailed his involvement in a previous spell, and Moratti has refused to deny that Ronaldo is one of the names on Inter's wish-list this summer.
"Ronaldo? Well, in this moment I can't suppose this or exclude it," Moratti told Gazzetta dello Sport.
"We are doing a wide observation looking at many players.
"I think this phase will continue for many more days, and so in this moment I can say nothing definite."
The Nerazzurri have also been heavily linked with Fiorentina star Luca Toni, and Moratti responded cryptically when quizzed on any interest from the Milan club towards the giant striker who is currently at the World Cup finals.
"There are persons at the club who are working on different fronts, I've just said it, and I am not ready to sum up the situation," Moratti added.
After finishing third in Serie A last season Inter are desperate to build a squad capable of challenging for their first Scudetto since 1989.