Kylian Mbappe admits to 'big mistake' as penalty miss costs Real Madrid again

A week after failing from the spot against Liverpool, French striker sees spot kick saved in 2-1 defeat to Athletic Bilbao

Real Madrid's Kylian Mbappe fails to convert a penalty against Athletic. EPA

Kylian Mbappe took ownership of his "big mistake" as the Real Madrid striker missed another penalty in a 2-1 La Liga defeat to Athletic Bilbao.

A week after he failed from the spot in the Uefa Champions League against Liverpool, the French superstar endured further misery from 12 yards as Athletic goalkeeper Julen Agirrezabala pulled off a superb save.

Defeat allowed league leaders Barcelona to retain their four-point advantage over Real Madrid.

Alejandro Berenguer fired Bilbao ahead early in the second half, with Jude Bellingham levelling for Madrid after Mbappe's penalty miss.

However, substitute Gorka Guruzeta snatched fourth-place Athletic victory in the 80th minute after a Fede Valverde error.

The defeat and Mbappe's penalty miss will heap further pressure on to the former Paris Saint-Germain striker's shoulders after plenty of criticism in recent weeks.

"A big mistake in a match where every detail counts. I take full responsibility for it," said Mbappe in a post on social media network Instagram.

"A difficult moment but it's the best time to change this situation and show who I am."

Madrid coach Carlo Ancelotti said the forward was downhearted after goalkeeper Julen Agirrezabala saved his penalty.

"Obviously [Mbappe] is sad, disappointed, but he has to continue," the Italian told reporters.

Mbappe has scored 10 goals in his first 20 games for Madrid across competitions but is struggling for consistency.

"He's not at his best level but we have to give him time to adapt, he's scored 10 goals, he can do better and he's working to do that," said Ancelotti.

Madrid were hoping to build on three consecutive wins in La Liga, despite missing Vinicius Junior and other injured stars, with Ancelotti bringing French midfielder Aurelien Tchouameni back into the starting line-up.

Thibaut Courtois made an important early intervention to deny Spain winger Nico Williams, with his brother Inaki Williams lurking dangerously.

It was a first half of few clear chances, but one played with intensity in front of a packed San Mames stadium.

Mbappe found the net but the goal was ruled out for offside and the referee reviewed a Rodrygo penalty appeal but decided the Brazilian winger went down too easily.

At the other end, Berenguer should have put the hosts ahead but blasted high over the bar after Inaki Williams' clever backheel teed him up.

The forward made amends early in the second half by bundling home from close range after Courtois could only palm an Inaki Williams cross into his path.

Mbappe had the chance to level for Madrid from the spot when Agirrezabala barrelled into Antonio Rudiger.

After missing his penalty against Liverpool, Mbappe agreed to let Bellingham take one against Getafe on Sunday.

However this time the French forward stepped up himself but his weak effort, again to the goalkeeper's left, was at a comfortable height for Agirrezabala to parry.

"These days we study everything a lot, I knew he was a good taker and he'd missed the last one, I thought he would go the same way and luckily he did," Agirrezabala told DAZN.

"I'm very happy for what was an incredible night, beating Real Madrid in front of our fans is so nice."