Football hooligans face a life-long ban from watching their teams if they cause trouble at this weekend's South coast derby.
Police do not want a repeat of the violence seen at last season's derby
Hampshire Police say a major policing operation is in place for Saturday's game, when Southampton play hosts to Portsmouth at St Mary's Stadium.
About 400 police officers and staff will be involved, including the dog support unit and police horses.
It follows the trouble at last season's derby at Fratton Park in March.
Ch Supt Paul Stickler said his officers would be "doing everything they can to ensure the match is a peaceful occasion for everybody".
"I hope that the small minority of people who attend football intent on causing trouble will learn their lesson from those arrested following the large scale public disorder at the match at Fratton Park.
"These people call themselves football fans, and yet through their actions, they could find themselves banned from watching their team for life or even in prison.
Ninety-three people were arrested, 64 of those were given banning orders and some were even jailed, following the trouble at Fratton Park on 21 March.