Real Madrid goalkeeper Keylor Navas has vowed to "return to good times" after making another high-profile mistake during Sunday night's La Liga clash with Real Betis.

Navas, who was fortunate not to be sent off in the first period after colliding with Betis midfielder Darko Brasanac, was at fault for the opening goal of the match after allowing Antonio Sanabria's tame effort to drop over the line.

The Costa Rican faced whistles from the Bernabeu in the second period of his team's 2-1 win, but the stopper is confident that he can once again win over the boo-boys in the Spanish capital.

"I stopped the shot [from Antonio Sanabria] and when I tried to catch it, my posture was not the best," Navas told reporters.

"I touched the ball with my right hand but it was bad luck, ugly. They are circumstances which you don't want to see but I had to keep going. I know my teammates trust me, and I've promised them that these things will not happen again.

"I enter the pitch very calmly and I try to do my work. There are times when things do not go well but you have to keep a cool head. I had good and bad moments but I hope to return to good times."

Cristiano Ronaldo levelled for Real Madrid in the 40th minute, before Sergio Ramos headed the home side's winner late on.