McGree has been stood down from international football until April 1,while Atkinson,Wales and Wilson won't be eligible to represent Australia until August 10 - effectively banning them from Tokyo 2020 if the Olyroos qualify.
Sources with knowledge of what occured have confirmed one of the players made contact with a woman through Tinder while in Cambodia and provided her with tickets to watch one of the team's matches at the AFC Under-23 Championship qualifying tournament in March.
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On the final night the player invited her to the team hotel,where she had consensual sex with the four players.
Although there is no suggestion of assault,the woman was aggrieved by the way she was treated and the fact that she was left stranded at the hotel by the players. She then contacted the Australian embassy with fears there were photos or videos taken of the encounter,a complaint she later withdrew - but by that stage,it had already been passed onto Sport Australia (formerly the Australian Sports Commission) and subsequently FFA.
It's unclear why McGree was handled more leniently than the other three players. All four of them broke a curfew set by coach Graham Arnold,although they did not leave the hotel on the night,the sources said.
"These sanctions are commensurate to the nature of the breaches of the National Code of Conduct which is in place to safeguard both the players and the reputation of Australian football,"FFA chairman Chris Nikou said.