The NRL have referred a man who sent an "abhorrent" message to Josh Morris to NSW Police, after the Sydney Roosters star was threatened for ruining a bet.
Morris was sent a message on social media on Sunday afternoon after the Roosters' win over Wests Tigers, calling him a "dog c***".
The sender claimed Morris had cost him a multi bet by not scoring, and threatened Morris by saying he was waiting for him at the front of the stadium.
Morris then posted a screenshot of the message with the user's account visible on his own Instagram story, before the NRL investigated.
"Our integrity unit is there to both administer the rules and provide support to our players," NRL CEO Andrew Abdo said.
"The Integrity Unit has conducted work confirming the identity of the individual involved and referred this abuse to the NSW Police online threats taskforce.
"I encourage all players and clubs to alert us whenever they are subject to any form of abuse.
"I want to congratulate Josh for calling out this abuse. What was sent to Josh was abhorrent.
"It's important that people realise these types of attitudes are not welcome in our game."
Issues of players receiving abusive feedback from fans has risen in the age of social media.
Melbourne flyer Josh Addo-Carr posted a photo on Instagram after this month's season opener of him holding a sign saying "No one cares about your multi".
Morris sent a similar message with his story on Sunday, claiming "this has to stop", while his stance also received the backing of the Rugby League Players' Association.
"This is yet another example of the appalling behaviour that our members are subjected to," RLPA chief operation officer Tim Lythe said.
"It's really sad that people feel that it is acceptable to abuse others in such a way.
"No person, not just NRL players, should be the subject of such abuse. It is entirely unacceptable.
"We commend Josh on calling this incident out and the other players who continue to make a stand.
"Online abuse and bullying is an issue we need to confront collectively - as a game and more broadly in society."