Football Federation Australia is preparing for a possible all Sydney A-League grand final, booking out ANZ Stadium to host the potential blockbuster on May 4.

The FFA has pencilled in ANZ Stadium to host the grand final if the Western Sydney Wanderers (second) meet Sydney FC (fourth) in the decider, but also haven't ruled out a switch to the Olympic venue if the Wanderers were to host a team from outside Sydney.

Dream match-up: An all-Sydney grand final would draw an estimated 80,000 crowd to ANZ Stadium, smashing the Australian football attendance record. Credit:Mark Nolan

An ANZ Stadium spokesperson told Fairfax Media that the FFA has also sounded out the possibility of playing a semi-final if the two teams were to clash in either of the two weeks of the playoffs.

The success of the local derby, which attracted a sell out crowd of 40,388 at Allianz Stadium in round three this season, has prompted the FFA to seek a larger venue in case the two teams meet in the finals.