The Police Minister Liza Harvey has warned Fremantle pubs and hotels to serve alcohol responsibly during Saturday's AFL grand final.

Under existing liquor licensing laws, venues can start serving alcohol as early as seven in the morning, more than five hours before bounce-down.

The Police Commissioner Karl O'Callaghan today raised concerns about the laws, telling a budget estimates hearing he wants to revisit the trading hours issue.

Mrs Harvey says she is giving licensees the chance to prove they can self-regulate.

"Hopefully those hoteliers and publicans will take their responsible service of alcohol responsibilities on board, and we'll get a good outcome," she said.