Ronaldo took a full part in warm-ups in front of the watching media but he was careful not to put his full weight on the strapped knee as the squad went through some jumping drills.
All eyes have been on the world player of the year's recovery from thigh and knee problems, despite his return to play 65 minutes of Portugal's final warm-up game against Ireland this week.
The Real Madrid forward, whose form and fitness will be vital to Portugal's chances, sparked new fears over his knee problem when he had it iced after training on Thursday.
Afterwards, Eduardo echoed team-mate William Carvalho's comments a day earlier when he said Ronaldo would be fit and ready for Monday's game in Salvador.
"Cristiano is training well, he's training hard and we are sure he's going to be 100 percent to help us and to have an excellent game," Eduardo said yesterday.