Eintracht Frankfurt chief executive Heribert Bruchhagen has said that he was "stunned" to see violence break out between supporters during a recent pre-season friendly against Leeds United.
Police in Austria arrested 25 people because of the clashes before and after Eintracht's 2-1 win on Tuesday.
Speaking to Die Welt, Bruchhagen said: "I never see the pleasure in violence. I am stunned. I don't know what it has to do with football.
"I regret that this has happened. It's not in the tradition of Eintracht. It was obvious that on both sides there were people who wanted confrontation."
Three Leeds supporters and two police officers were injured in the clashes.
No Data Analysis info
