Madrid moved back to the top of LaLiga after Sergio Ramos' late winner earned them a comeback victory against 10-man Betis at the Bernabeu.
They are now two points clear of Barcelona after Luis Enrique's side slumped to a 2-1 defeat at lowly Deportivo La Coruna earlier on Sunday, but had trailed Betis following a howler by Navas in the first half.
Cristiano Ronaldo equalised in the 41st minute before Ramos scored a bullet header from a corner nine minutes from time - moments after Betis defender Cristiano Piccini was shown a second yellow card for his foul on Lucas Vazquez.
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Navas was fortunate to still be on the pitch following a rash challenge on Darko Brasanac midway through the opening half when he came off his line to deal with a long punt forward but missed the ball and took out the Betis striker instead.
Despite the significant contact from Navas, referee Antonio Mateu Lahoz concluded that it was not a foul, and the Costa Rican escaped what should have been a straight red card.
With the incident perhaps still playing on his mind, Navas then gifted Betis the opener. Antonio Sanabria shot from distance but Navas failed to deal with his effort before spilling the ball over the line.
However, once Madrid went ahead Navas made amends for his early error as he denied Sanabria with a brilliant save in the final minute of stoppage time to put Madrid back in pole position for the title.
"At the interval I didn't say anything to him," Zidane said in quotes reported by marca.com.
"It is part of the game, he can make a mistake like everyone else.
"At the end, he saved the game for us and I, like all of the players, are still in support of Keylor.
"I didn't see the replays (for Navas' potential red card), I can't say anything about it."
Zidane also praised his side's attacking talents but conceded they are not yet the finished article.
"Real Madrid can score at any given moment, you have to have a cool head," he continued.
"At the end we won due to a set play, from which we are very strong, but I would like to score more goals in other ways, from open play.
"I'm sure that many are annoyed by Real Madrid, but it is normal, it's our identity and we annoy a lot of people.
"On reflection it's good because we took three points, we struggled at the end but I am happy and have to praise the players."
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