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.
“He is so good that when things don’t go as he is used to then people start to talk about him,” Zidane said on Tuesday ahead of Real’s Champions League dead rubber against Borussia Dortmund.
“He will keep trying until the goals come. Not long ago, only last year, he had a phenomenal season.
“There is a long way to go, we are only nearly halfway though the season. Be careful with Cristiano.”
Cristiano Ronaldo will reportedly receive the Ballon d’Or atop the Eiffel Tower, according to reports in Spain. 🏆 pic.twitter.com/a9o6Liyg4z
— B/R Football (@brfootball) December 4, 2017
With Karim Benzema also failing to find the net regularly, a lack of goals has blighted Real’s season so far.
Until September, Zidane’s men had scored in 73 straight games.
However, they have now drawn blanks in three of their last nine La Liga outings against Real Betis, Atletico Madrid and on Saturday in a 0-0 stalemate at Athletic Bilbao.
Zidane, though, rejected widespread suggestions, most recently from Valencia coach Marcelino Garcia Toral, that Madrid’s squad is poorer this season for the loss of Alvaro Morata, James Rodriguez and Pepe in the off-season.
“It is true that we need to score more goals because, being eight points behind in La Liga, the situation isn’t ideal,” added Zidane.
“But I am calm because I know that sooner or later that will change. No matter what people on the outside say, possibly they aren’t seeing what I am.
“We also can’t forget what this team has achieved. I certainly haven’t.”
With Madrid already assured of second place in Group H behind Tottenham Hotspur, Zidane is expected to heavily rotate his side against Dortmund ahead of a busy end to the year for Real.
The European champions host Sevilla on Saturday before jetting off to Abu Dhabi for the Club World Cup and then face Barcelona at the Santiago Bernabeu on December 23.
Real Madrid have signed a new five-year deal with their sponsors Nivea Men, in an agreement that spans 70 countries.
Los Blancos have been partners with the leading men-care brand since 2013 in select markets but the new deal extends their relationship across the globe.
In celebration of the agreement, Nivea Men have released a behind-the-scenes video where Real Madrid players Sergio Ramos, Marcelo, Isco and Lucas Vazquez share personal insights from the locker room offering fans the chance to get to know the "men behind the players" – their rituals, their motivations and their preparation techniques.
Madrid failed to capitalise on Barca’s 2-2 draw at home to Celta Vigo earlier in the day as they played out a 0-0 stalemate at Athletic Bilbao to drop points for the sixth time in 14 La Liga games so far this season.
“For me the most important thing is to keep thinking that we are going to have another opportunity throughout the course of the season to cut the gap,” said Zidane.
That opportunity to cut the eight-point gap between the sides is most likely to come when Madrid host Barcelona in three weeks time.
However, Real could go into that match down in fifth in the table as they currently lead Sevilla only on goal difference in fourth and trail Valencia and Atletico Madrid.
Zidane’s men will also be depleted without captain Sergio Ramos, who saw his 24th career red card late on at Sam Mames, Dani Carvajal and Casemiro through suspension when Sevilla visit the Bernabeu next weekend.
And Real will play a game fewer in La Liga than their rivals before the end of the year as they jet off to contest the Club World Cup between the 13th and 16th of December.
“At the moment there are three teams in front of us, but there are still six months left. We are at little behind, but there is a long way to go,” added Zidane.
Zidane had shown his intent to pounce on Barca’s slip-up by naming his strongest available side as Gareth Bale once again missed out through injury.
Without the man from Cardiff, Madrid started with the same line-up that started the Champions League final in the Welsh capital six months ago.
However, Zidane insisted it is merely results and not the level of performance that has changed for Real since they swept Juventus aside to retain the Champions League and beat Barcelona to the La Liga title last season.
“It is the result, nothing more. When I look at the game today, I can’t say we are playing worse,” added the Frenchman.
“What changes things are goals. That day we scored four against Juve and today we couldn’t score.
“Last season we would score goals in the last minute and at the moment that isn’t happening.
“We need to keep going and think that there will be better moments to come.”
— Real Madrid C.F.🇬🇧 (@realmadriden) December 2, 2017