The circulation of explicit photos of a woman wearing a Richmond Tigers star's AFL premiership medal is under police investigation.
The woman did not agree to the photos being sent out, police say.
"Yarra Crime Investigation Unit detectives are investigating an image distributed on social media," police said in a statement.
"The image was posted without consent.
"As the investigation is ongoing it would be inappropriate to comment further."
Reports of the photos emerged late last week.
The images published by News Corp show a topless woman wearing the 2017 premiership medal and in another, she has her back to the camera and is holding a football in front of a wall with a Richmond logo on it.
Her face is not shown in either photo and the player whose medal she is wearing is also not identified.
Richmond beat the Adelaide Crows in the September 30 grand final.
The football club's president Peggy O'Neal appeared on ABC television's Q&A program on Monday night and said she did not have all the facts so she could not comment specifically.
"But if it turns out that it is disrespectful to women, we certainly don't stand for that, that's not what our club's about, and if someone has made a disrespectful and humiliating gesture, then of course it will be taken into account," she said.