The Spain winger asked referee Juan Martinez to stop the match midway through the first half at Estadio Civitas Metropolitano.

The game was paused to make an announcement to the crowd, and Atletico players Antoine Griezmann and Jose Maria Gimenez appeared to urge their fans to stop the chanting before play resumed.

“I have gone to take a corner and I have heard monkey sounds,” 21-year-old Williams told DAZN.

“There are stupid people everywhere, but nothing happens. We have to keep working.

“I hope this changes little by little because in the end we are fighting internally and externally against this.”

Williams was booed by some fans throughout, which intensified when the match was stopped and after he equalised just before half-time.

Talking about his goal celebration, he said: “It comes with a bit of anger.

“It is not normal that they still insult you because of your skin tone.”

Williams’ brother and team-mate Inaki Williams said: “The jeers should be directed at the people who said the insults and not at the victim.”

Writing on social media, Atletico said the club were “against any act of racism or hatred”.

A La Liga statement read: “There’s no place for racist or hateful behaviour in sport.

“La Liga vehemently condemns any racist acts and will continue working to eradicate this inexcusable behaviour from our sport.”

Williams cancelled out Rodrigo de Paul’s opener, but Angel Correa’s effort early in the second half and an own goal from Athletic goalkeeper Unai Simon earned Atletico victory.

They are six points clear of fifth-placed Athletic with five games remaining this season, leaving them well positioned to secure Champions League football next season.

Last month Real Madrid filed a complaint with the Spanish legal authorities after a video on social media appeared to show Atletico fans chanting a racist slur about Brazilian forward Vinicius Jr.

Rayo Majadahonda players walked off the pitch in the 84th minute and refused to return when Cheikh Kane Sarr was sent off for going into the stands to confront a rival fan.

As punishment for refusing to complete Saturday’s match against Sestao River, the club were given an automatic 3-0 defeat, while they have also been deducted three points and fined 3,006 euros (£2,575).

Opponents Sestao, who led 2-1 before the incident, have been ordered to play two home games behind closed doors and have been fined 6,001 euros (£5,140) for “failing to act diligently or co-operate in the repression of violent, racist, xenophobic or intolerant behaviour”.

Senegalese goalkeeper Sarr, 23, said: “I grabbed him and asked why he was insulting me. My attitude was not aggressive, I just wanted to ask him why.”

He added: “It was something horrible and I could not stop myself. It was a very sad and ugly thing what they were saying.”

The Spanish Football Federation (RFEF) judged Sarr’s reaction to be “contrary to good sporting order” but said there were “mitigating circumstances” because of “justified sufficient provocation, motivated by the racist insults received”.

The Sestao supporter who was confronted by Sarr pressed charges against the goalkeeper for assault. The Basque club’s security officer Rafa Guadix denied there had been any racist insults in an interview with radio station COPE.

It comes after the RFEF ordered Spanish top-flight club Getafe to partially close their central stand for three matches as punishment for racist and xenophobic abuse by fans last weekend.

Saturday’s La Liga game was paused in the 68th minute when Getafe fans hurled abuse at Sevilla defender Marcos Acuna and manager Quique Sanchez Flores. The match restarted after two and a half minutes with no further incidents.

Getafe have also been fined 27,000 euros (£23,000) and the partial stadium closure will run across their next three home fixtures against Real Sociedad (21 April), Athletic Bilbao (5 May) and Atletico Madrid (15 May).

The RFEF said in a statement that the closed area in the stands at Estadio Coliseum must display a visible message condemning violent, racist, xenophobic and intolerant acts in football and support fair play.

Real Madrid and Brazil winger Vinicius, who last month said he felt “less and less” like playing football because of the repeated racism he has faced during his time in Spain, responded to the incidents on social media: “Racists must be exposed and matches cannot continue with them in the stands”.

He added: “We will only have victory when the racists leave the stadiums and go straight to jail, the place they deserve.”

Last season there were 10 racist incidents against Vinicius reported to prosecutors by La Liga.

Last week, Spain’s friendly against Brazil was played as part of an anti-racism campaign in support of the 23-year-old.

Maignan alerted the referee before leaving the pitch after the half-hour mark, followed by his teammates.

The incident took place shortly after Milan midfielder Ruben Loftus-Cheek had given the visitors the lead with a low first-time shot inside the post.

The Serie A match was restarted after about 10 minutes.

AC Milan posted on X: “There is absolutely no place in our game for racism: we are appalled. We are with you, Mike.”

France international Maignan, 28, was beaten three minutes later by a Lazar Samardzic shot before Florian Thauvin put Udinese in front in the 62nd minute.

But Milan snatched victory when substitute Luka Jovic netted a rebound with seven minutes left and Noah Okafor made it 3-2 in stoppage time from close range.

Milan are third in the table, six points behind leaders Inter Milan and four adrift of second-placed Juventus, who both have a game in hand.