The Portugal forward struggled with a knee injury towards the end of last season and picked up a hamstring strain last month - missing out on Real's 4-2 defeat at Real Sociedad.
Ronaldo has not played since his side's 2-0 win over Cordoba on the opening weekend of the season and was omitted from the Portugal squad for the Euro 2016 qualifier against Albania.
"He is on top form," he said. "He has been training very well these past three weeks and he does not have any problems.
"He is in optimal condition. He doesn't have a chronic injury.
"Last season he had one injury and now another. It's nothing chronic."
"We are very happy with Chicharito," he continued. "Tomorrow he won't play from the beginning but he will be of use during the game."
"It's clear that a new player needs time to adapt," he added. "I am pleased with what he has done so far.
"It's normal that he might have the odd problem at the start."
