Brad Fittler says the NRL should sanction rival players – led by Rabbitohs star Latrell Mitchell – who have made public comments on Spencer Leniu’s upcoming judiciary hearing.

But South Sydney have backed Mitchell to continue speaking out on social justice matters following his comments on Leniu’s prospective ban, support for Brisbane’s Ezra Mam and war of words with Anthony Mundine.

Leniu has pleaded guilty to calling Mam a “monkey” in last week’s Las Vegas season-opener and issued a public apology ahead of Monday’s judiciary hearing, where the Roosters enforcer will be sentenced.

Fittler spoke to the concerns raised privately with the NRL by members of Leniu’s camp on The Sunday Footy Show, taking issue with public comments by players that could prejudice the front-rower’s chances of a fair hearing.

Mitchell has made several comments on the matter on social media, including a post that suggested an 8-12 week ban by replying “and then some”, while fellow Indigenous leader Nicho Hynes also urged the NRL to “draw a line in the sand” regarding sanctions for racial vilification.

Fittler, who coached both players at Origin level and has been a strong proponent of Indigenous issues in the game, believes the commentary is out of line.

“Why doesn’t everyone ring Ezra? Why does everything have to be done on social media?” Fittler said.

“The NRL has rules where you can’t come out and make comments about situations that are going to judiciary. So they should be in trouble. If you want to support Ezra, ring him up. Go and see him. That’s how you support someone.”