However, Ronaldo leads the goalscoring charts in the Champions League with eight in five games and Zidane expects that form to soon return on league duty.
Ronaldo has scored just twice in 10 La Liga matches this season as a stumbling start by Madrid has left them eight points adrift of leaders Barcelona.
And speaking at a news conference ahead of Wednesday's final Group H game at home to Borussia Dortmund, with his team having qualified, Zidane said: "I repeat myself a lot, say the same thing every three days, and even I get exhausted of it".
After dominating domestic and European football last season, Real Madrid are struggling so far this term. Not long ago, only past year, he had a phenomenal season. We have to remain calm, maintain confidence and go objective by objective.
But with a lot more work to do in the league, Zinedine Zidane's side will have to play well against fifth-placed Sevilla on Saturday, to avoid falling behind them, and further behind Barca in La Liga. I'd urge everyone not to forget what this team has achieved. Sometimes we have had the odd disagreement over decisions but what matters is that we are both playing for the same team.
Real are guaranteed to finish second in Group H behind Tottenham Hotspur, while Dortmund need to win to secure third spot in the group and a place in the Europa League as they are locked on two points with fourth-placed APOEL Nicosia but have a superior head-to-head record.
Clásico on December 23: "Hopefully we'll come back with another title because it's good for the morale of the squad".
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