NSW Police have promised a "huge" presence at Moore Park on Saturday night where upwards of 80,000 sports fans will pour into the precinct for the unprecedented Sydney derby double at Allianz Stadium and the SCG.

The A-League clash between Sydney FC and the Wanderers and the Big Bash game next door between the Thunder and Sixers are both expected to sell-out, which would likely generate the largest sporting crowd seen at Moore Park.

Detective superintendent and commander of the NSW Police state planning unit Gavin Dengate said his forces had worked closely with the SCG, both A-League clubs and Football Federation Australia to shore up the logistics of Saturday night's derby double.

The State Transit Authority has increased its bus services to and from the ground and superintendent Dengate has encouraged fans attending either game to use public transport.