Flick's tactical approach, featuring an extremely high defensive line, also seemed ripe for Mbappe and Vinicius to pillage with their pace.
"Real Madrid strongly condemns any kind of behaviour involving racism, xenophobia or violence in football and sport, and deeply regrets the insults that a few fans uttered last night in one of the corners of the stadium," said Los Blancos in a statement Sunday.
"We are hurt, it's a tough moment, but I want to thank the fans for their support. We don't have to throw everything away, because there is nothing to throw away," added a downhearted Ancelotti.
The Catalan giants triumphed at the Santiago Bernabeu to snap Madrid's run of 42 matches unbeaten and continue their own revival under the German coach who arrived this summer.
Robert Lewandowski struck twice in two minutes as Barcelona crushed rivals Real Madrid 4-0 on Saturday, inflicting the Spanish champions' first La Liga defeat in over a year.
Defending champions Real Madrid are set to host archrivals Barcelona in a LaLiga game at the Santiago Bernabeu tonight.
Kylian Mbappe's start at Real Madrid has been satisfactory, his performances neither spectacular nor underwhelming, but Saturday's La Liga Clasico offers the French superstar a springboard to kick on from.
The viral social media campaign before the September 29 clash encouraged Atletico fans to arrive at the club's Metropolitano stadium and utter "degrading and discriminatory insults with racist connotations" against a Real player, police said.
Real Madrid duo Thibaut Courtois and Rodrygo are likely to miss the Clasico clash with La Liga leaders Barcelona on Saturday with injury problems.
Gerard Pique delivers Barcelona's match winner over Real Madrid as El Clasico Miami lives up to the hype.
El Clasico fever grips Miami as Barcelona and Real Madrid are set to meet on foreign soil for the first time in 35 years.
Gareth Bale could miss the rest of Real Madrid's season after suffering the latest in a series of calf injuries since he joined the Spanish giants four years ago.
Zinedine Zidane criticised his Real Madrid players after their dramatic Clasico defeat to Barcelona, insisting they should have been smarter in the closing stages of their loss.
The records continue to tumble for Lionel Messi, with the Barcelona star now the leading goalscorer in El Clasico in La Liga after equalising against Real Madrid.
Luis Enrique, who can't call on the suspended Neymar Jr nor the injured Rafinha, Aleix Vidal and Mathieu, has left out Masip and included Aleñá in his match day squad for the game against Real Madrid.
Neymar looks set to travel with the Barcelona squad for Sunday's El Clasico against Real Madrid as the Catalans continue to fight his suspension for the potentially title-deciding clash.
Cristiano Ronaldo has made a habit of defying his critics and will try to do so again by leading Real Madrid one step closer to the Spanish title on Sunday against bitter rivals Barcelona.
Lionel Messi requires two more goals to reach 500 for Barcelona and will have his sights set on achieving the milestone against great rivals Real Madrid in Sunday's Clasico.
Lionel Messi kept Barcelona's title hopes alive with two goals and an assist to see off Real Sociedad 3-2 as Spain's top two edged five-goal thrillers ahead of next weekend's El Clasico.