Jarryd Hayne's former teammate Krisnan Inu is under investigation by his club after his comments surrounding the fallen NRL star's sentencing this week.

It comes just one day after rugby league star Tony Williams was sacked by his New York club after making "appalling" social media posts about the victim in Hayne's sexual assault case.

The ex-superstar of Australian sport will be jailed for at least three years and eight months without parole for sexually assaulting a woman in her Newcastle home in 2018. He was given a maximum sentence of five years and nine months.

Hayne had been found guilty of two counts of sexual intercourse without consent.

The convicted sex offender has launched an appeal against his conviction.

Hayne's supporters have stuck by him after the conviction, with Inu and Williams both posting messages on social media that sparked outrage.

The comments made by Inu, who joined the Warriors from the Eels after the 2010 NRL season and played 21 games for the club, are now the subject of an investigation from his Super League team Salford, where he is playing in the UK.

The club has announced Inu's comments are being reviewed.

"We are aware of the social media activity of one of our players over the last 24 hours," the club wrote in a brief statement posted to the club's official Twitter account.

"An internal investigation is underway and there will be no further comment from the club at this time."