Millwall fans who shamed Wembley by fighting a bloody battle amongst themselves while their team slumped to an FA Cup semi-final defeat will face life bans, the London club has warned.
Eleven people were arrested after violent scuffles broke out towards the end of their 2-0 defeat by Wigan Athletic.
Police wielding batons eventually brought the disorder under control, and the Metropolitan Police said four officers had sustained minor injuries.
Millwall chief executive Andy Ambler says anyone associated with the club found guilty of violent behaviour will be banned indefinitely from Millwall matches in addition to any punishment they receive from the authorities.
The fighting, which left many young children in the stands in tears, came on the weekend of the 24th anniversary of the Hillsborough disaster.
One Millwall fan was even highlighted on television, snatching a police officer's helmet and smilingly tucking it inside his jacket.
The London club had long been associated with violence and hooliganism in the 1970s and 1980s but have been making strides to combat the problem in recent years.