UEFA president Alexander Ceferin on Wednesday called hooliganism "the cancer of football" and urged Europe to play its role in eliminating it.
The statement comes days after a man was killed in clashes before a match between AEK Athens and Dinamo Zagreb in Greece.
After a meeting with Greek Prime Minister Kyriakos Mitsotakis in Athens, Ceferin said that the problem was widespread in Europe and cooperation was required in order to ensure that such incidents don’t take place in the future.
"This is the cancer of football and those are not football fans," Ceferin said. "We came to a position where we have to say enough... we have to stop this.
"Violence and hooliganism are not only a Greek problem," he said adding European countries, institutions and media need to be on the same page to help end football violence.
More than 100 people, most of them Croatian citizens, have been charged with felony and detained pending trial over the clashes that led to 29-year-old AEK fan Michalis Katsouris being stabbed to death in Athens, Greek authorities said.
The pre-trial detentions have led to tension between Greece and Croatia on a political level.
Greek diplomats said the country's foreign minister George Gerapetritis assured his Croatian counterpart that the rights of those detained would be fully respected.
Greece has made repeated efforts to reform football, which has been plagued by violence on and off the pitch.
Last year, a 19-year-old fan was beaten and stabbed to death outside Aris Thessaloniki's stadium.
Mitsotakis said that Greece was exploring a further tightening of rules to help end violence at sporting events.
— Additional input from Reuters