UEFA confirmed Saturday disciplinary action against the Croatian football federation after stadium disturbances in St Etienne.
A spokesperson for European football's organizing body said the disciplinary committee is to meet Monday to discuss possible sanctions.
Croatia's Euro 2016 match against the Czech Republic on Friday was interrupted after 87 minutes when flares were fired onto the pitch and supporters started fighting among themselves.
Croatia were leading 2-1 at the time. After the match was restarted, the Czech Republic equalized in the dying seconds of the game with a penalty to complete a comeback from two goals down.
Croatian fans have been involved in a number of incidents at past tournaments and internationals which have led to UEFA sanctions.
Former Croatia midfield star Robert Prosinecki was the latest person to condemn the violence.
"It was intentional, a planned provocation. It is always the same," Prosinecki told dpa. "But it is also a problem of the Croatian state. It is always the same 50 hooligans and they know exactly who they are. But nothing is happening."
There seems to be a consensus that the incidents are to harm the leadership of Croatian football and its problems with corruption and mafia-like structures. This appears more pressing than to ensure success of the team.
"Who gives them the right to steal the tournament from (Luka) Modric, (Ivan) Rakitic and (Ivan) Perisic)?" the Vecernji List paper asked Saturday.
Also under investigation by UEFA, and to be discussed Monday, is Turkey after its fans lit fireworks, threw objects onto the pitch and attempted to invade the pitch.