Madrid's Clinico San Carlos hospital said a man died of injuries sustained in the clash between rival fans that broke out hours before the game yesterday near the Vicente Calderon stadium. Police made several arrests.
The man, identified only as a 43-year-old Deportivo fan, had to be removed from Madrid's Manzanares River and attended to by emergency services, which initially resuscitated him before transferring him to hospital where he died hours later.
The presidents of both clubs appeared together on television to lament the incident.
"This has nothing to do with football," said Atletico president Enrique Cerezo. "Neither Atletico nor Deportivo have anything to do with these incidents, they are organized by radical groups who have their histories and accounts to settle."
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Sports minister Jose Ignacio Wert also said the clash was not linked to sport, but it nevertheless tarnished its image and "had to be eradicated."
Police said on its Twitter account they had made 24 arrests among four radical groups linked to football clubs, and named them as: "Riazor Blues, Atletico Front, Buccaneers, and Alkor Hooligans."
The 11 injured included a police officer who suffered a broken finger.
"We are very sad, and we condemn this completely," said Atletico coach Diego Simeone. "We hope these types of situations don't happen again."