Canberra Raiders are investigating an alleged major incident involving a player during the club's Mad Monday celebrations.
Raiders chief executive Don Furner held a press conference in Canberra on Thursday to address allegations of a photograph of a Canberra player in an uncompromising position with a dog.
The NRL has launched an investigation into the incident.
Furner said that he would be "dumbfounded " and "appalled" if the image were proven to be true - but he stressed that he was yet to see the photo personally.
The photo was posted on Twitter by a Melbourne radio station, but it has since been removed.
''If he did it, it is something he will live with for the rest of his life," Furner said.
'We dont know whether it's authentic but I am as appalled as everyone else.
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"If he did do it, I don't know why he would do it."
The Raiders are continuing to investigate the allegations.