Milan medical chiefs say Ronaldo will be available for the club's Serie A clash with Siena on September 5. A problem with the striker's knee has been discover.
However, Brazil doctors say differently, with Jose Luis Runco telling O Globo: "We will apply a treatment we call Growth Factor.
"He should stay in Rio for at least a week."
Ronaldo's personal physiotherapist Bruno Mazziotti is also in Brazil with the Milan striker.
Yesterday, Mazziotti rapped: "We think that the treatment Milan gave him wasn't the correct course of action."