Two board members resigned from Football Federation Australia in protest at being kept in the dark over the Olyroos' Cambodian sex scandal by chairman Chris Nikou, whose position is up for a vote at Thursday's annual general meeting.

Crispin Murray and Kelly Bayer Rosmarin officially resigned as directors last month - preempting the expiry of their terms on Thursday - with FFA sources suggesting they stepped down early because of a lack of transparency regarding the incident in Phnom Penh, which has led to international bans for four A-League players.

Chris Nikou will have to survive a vote at Thursday's AGM to retain his place as FFA chairman. Credit:AAP

The incident occurred in March but FFA sources have claimed Nikou only told the rest of the board once the investigation had commenced, causing frustration and angst among some of the other directors.

After two new directors are elected at Thursday's AGM to replace Murray and Rosmarin, whose resignations have not been publicly acknowledged by FFA, the board will vote to decide whether Nikou will retain his position as chairman as stipulated by the governing body's constitution.