Ronaldo appeared to be in good shape as he trained separately from the remainder of the squad on Saturday, as did striker Karim Benzema, who has been suffering from a back injury, reports Efe.
Real Madrid open their La Liga campaign with a trip to Real Sociedad on Sunday, but coach Zidane has yet to set a target for Ronaldo and Benzema's return to action.
"I can't give a precise date for Ronaldo's return. It's good that Cristiano is back on the pitch, playing with the ball, it's a good sign. He wants to come back as fast as possible and I'm happy to have him back at training," Zidane was quoted as saying by Sky Sports.
"You need to take your time with these things, I spoke to Karim and he knows that we don't want him to come back and then get injured again. We want him to come back at 100 percent."
Last season Real won their 11th Champions League crown by beating local rivals Atletico in the final and they have also collected the European Super Cup with a victory over Sevilla.
This term Zidane has said that his team's priority will be to wrench the La Liga title away from title holders FC Barcelona, and put an end to their rival's domination of the domestic competitions.
