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.

'Thought he would go same way'

Mbappe had the chance to level for Madrid from the spot when Athletic goalkeeper Julen 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."

Mbappe did play a part in Madrid's equaliser, though, with a vicious drive from distance that the stopper could only push out into the path of Bellingham, who finished tidily for his fourth goal in his last four league games.

Madrid were only level for two minutes before Bilbao regained the lead through Guruzeta, who stole the ball as Valverde prepared to pass and fired low past Courtois.

Mbappe cut a deflated figure in the final stages, with one attempt to break in down the left quickly shut down by the Bilbao defence to raucous cheers from their jubilant supporters.

Barcelona thrashed Mallorca 5-1 on Tuesday to move four points clear of Madrid, who have played one game fewer.

Last season Real Madrid lost just twice across all competitions on their way to a La Liga and Champions League double, but this was their fifth defeat of the current campaign.

"Bit by bit we will get players back (from injury) and we will improve our level," pledged Ancelotti.

AFP

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'Sad, disappointed' Mbappe pays penalty as Bilbao beat Real Madrid