"We were very good against Getafe, but now we must think about Tuesday".
Former Real winger Angel Di Maria is likely to take the Brazilian's place at the Parc des Princes as PSG chase down a 3-1 deficit from the first leg against the 12-times European champions.
A Francisco Portillo penalty briefly gave the visitors hope, but Ronaldo's second goal of the game assured the points stayed in Madrid ahead of next week's season defining Champions League tie.
Zidane added: "The team looks better than it did four days ago, I'm sure of that". It was very important to win.
Madrid midfielders Luka Modric and Toni Kroos were again absent from training on Friday due to a knee and hamstring injury respectively, increasing concerns they will not be fit for the second leg in the French capital.
"We will have three days of good mood in the squad".
"But my choice was made and I would have been frustrated at the end of my career not to try to play overseas".
Atletico, who clinched the 2014 title at the Nou Camp but have not won there since 2016, could have cut the gap on Barca to two points with a victory but coach Diego Simeone opted for a typically conservative approach.
"What we have to do is play our game without thinking about the atmosphere", he explained.
But Zidane, who has injury concerns of his own with Los Blancos, rejected the notion it will be a one-sided affair without the presence of the Brazilian superstar.
On Ronaldo, the manager said: "He'll be with us in Paris and I'm thrilled because he's enjoying an incredible run of form".
"The most important thing is that Marcelo is available tomorrow".
"We expect to face a very tough team in front of us and we will have to have the maximum concentration, play like we did here at home and will try to use our weapons to get through". This has caused the PSG goal-keeper to go on to say, "We were serious from start to finish", he told Canal+ in an interview.