The Portuguese attacker missed Saturday's 4-0 victory over Real Valladolid at the Santiago Bernabeu because of a hamstring complaint.
However, despite reports that he could be sidelined for a couple more weeks, the 28-year-old has insisted that he is now fit.
"I no longer have an injury. I have been fine for a couple of days," he told an awards ceremony in Madrid.
Ronaldo has scored 25 goals in 18 outings for Los Blancos this term.