Football club Port Vale has said it would fully back any police action against any of its fans involved after trouble broke out between fans of Wolverhampton Wanderers and the team.
Port Vale club secretary Bill Lodey said: "The club are bitterly disappointed regarding the violence that has been reported in Burslem town centre.
"We will fully support any actions taken by the police in apprehending those responsible and they can expect severe penalties."
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."