The pair clashed at the end of victory over Getafe, with Ronaldo questioning Zidane's substitutions.
Don Balon says Ronaldo was baffled by the decision to throw on Marcelo with the game already settled. The Brazil international has been recovering from a knock and Zidane handed him a second-half appearance yesterday.
Ronaldo believed Zidane was taking an unnecessary gamble with Marcelo needed for the second-leg of their Champions League tie this week. The Portuguese confronted Zidane after the game and also complained he chose to keep Karim Benzema, Gareth Bale and Sergio Ramos on the pitch for the full 90 when it was a good opportunity to give them time to rest.