GWS players face potential AFL sanctions, with an investigation underway after an anonymous complaint about an end-of-season function.
The league and the Giants have confirmed they are looking into what happened at the event last month, days after their season ended with the semi-final loss to premiers Brisbane.
"The AFL and GWS have been undertaking an investigation into the Giants players' post-season event, which is in its final stages," the league said in a statement.
The AFL and the Giants have not confirmed what prompted the investigation, or what action the league might take.
GWS released a statement late on Tuesday, saying: "the Giants are aware of an anonymous allegation of inappropriate behaviour at the players' end-of-season function last month.
"The club and its integrity unit have been working with the AFL's integrity unit to investigate."
GWS had a straight-set exit last month after finishing fourth in the regular season, blowing leads in their qualifying final against Sydney and the home semi-final against the Lions.
