Israel Folau faces a showdown with Australian rugby chiefs after posting anti-gay views on social media.

In a statement, Rugby Australia described content within the post as “unacceptable” and said its integrity unit was looking into Folau’s conduct.

The Wallabies star was warned last year, but avoided any disciplinary action, for making homophobic comments on his social media channels.

“Our work with national governing bodies and International Federations, alongside our Rainbow Laces campaign, aims to give people the confidence to tackle anti-LGBT abuse and show their visible support for lesbian, gay, bi and trans people, on and off the field.

“The more players, fans, clubs and organisations that stand up for equality, the sooner we kick discrimination out and make sport everyone’s game.”

Folau has won 73 caps and is a key part of Australia head coach Michael Cheika’s World Cup plans this year. Last weekend, he broke the Super Rugby try-scoring record.

He currently has a contract with the Wallabies and Sydney-based Waratahs that does not expire until 2022.

In a Twitter post on Wednesday, meanwhile, Folau became involved in Tasmania’s gender birth certificate debate.

Tasmanian authorities have decided, in a ground-breaking move for an Australian state or territory, to make genders optional on birth certificates.

But in response to that, above a screenshot of a report on the subject, Folau tweeted: “The devil has blinded so many people in this world, REPENT and turn away from your evil ways. Turn to Jesus Christ who will set you free.”

Former Wales international Gareth Thomas, who came out as gay in 2009, responded on Twitter.

The 44-year-old wrote: “I don’t write this with hate or anger after Israel Folau’s comments. I write with sympathy. To everyone who reads it, don’t be influenced by his words. Be the better person and be YOU. Whoever YOU is..Hell doesn’t await YOU.Happiness awaits YOU.”

International Gay Rugby, the global organisation for the world’s gay and inclusive rugby clubs, said in a statement: “The effects these hateful comments will have on LGBT people are enormously harmful.

“We want all LGBT athletes out there to know that rugby is a sport where you are welcome and respected, a sport of values that doesn’t allow for such bigotry or discrimination of any kind.

“We are taking a keen interest on the findings of Rugby Australia’s Integrity Unit when they meet tonight and applaud the union for taking the stance that these kinds of comments are unacceptable.”