Atletico Madrid have condemned “unacceptable” chants directed at Real Madrid’s Vinicius Junior outside their stadium prior to Sunday’s La Liga derby.
Before Real Madrid’s 2-1 victory, some fans sang racist songs as they entered Wanda Metropolitano.
Atletico say they will co-operate in an investigation by the authorities.
“These chants provoke enormous repulsion and indignation,” an Atletico Madrid statement read.
“We will not allow any individual to hide behind our colours to utter insults of a racist or xenophobic nature.”
Atletico Madrid has requested that the authorities identify the chanting fans so that they can proceed with their “immediate expulsion” from the club.
The statement added: “Our club has always been known for being an open and inclusive space for fans of different nationalities, cultures, races, and social classes, and a few cannot tarnish the image of thousands and thousands of Atleti fans who support their team with passion and respect for their opponents.