Real are third in the Liga standings and saw a five-game winning streak in all competitions snapped by a surprise 1-0 defeat to Espanyol on Tuesday, leaving them 15 points behind table-topping Barcelona and 10 adrift of second-placed Atletico Madrid.
Barcelona have not lost a single game this season en route to topping the pile, but Zidane has insisted that the reigning champions can still catch their rivals in the latter stages of the campaign.
"I still think there is a [chance of winning the] league for us".
"We're going to fight until the end of the league". It's hard but not impossible.
"Marcelo is going to be with us, no doubt about that", Zidane told reporters on Friday.
"We're angry about losing on Tuesday and I'm even more so after Barcelona's draw yesterday (Thursday against Las Palmas)". We have to go out and give everything.
Cristiano Ronaldo and his Real Madrid team-mates have been finalising their preparations for Saturday's La Liga clash with Getafe in a light-hearted training session at their Valdebebas base. If we're always motivated and thinking about the game, then we can achieve something great.
The Brazilian is therefore ruled out of PSG's Champions League last-16 second-leg against Real on Tuesday.
Influential leftback Marcelo completed full training for a second day in a row after recovering from a hamstring problem and Zidane said he could feature against Getafe.
Manager Jose Bordalas, expecting a wounded Real, said: "We always think about making a good game, but we know that to get something from there you have to touch perfection". If Atletico win [at the Camp Nou] on Sunday they will be two points back, nobody expected that. They'll be really focused, it's one of the biggest games of the year for them. It's going to be a hard game but we knew that from the beginning of the tie.
During the clip, when asked to describe himself in two words, he added: "I have imagination and I am daring". "But first, to prepare for Tuesday, we must prepare for tomorrow's game and play well".