Vunipola's post was also liked by several worldwide players, including England's Ellis Genge and Manu Tuilagi. If that's not to continue playing, so be it.
The same report claims Folau's team will also consider attacking the clause in Folau's contract that RA is using as grounds for his expected termination.
Folau was unstoppable in the NRL and he proved just as damaging in rugby union.
Folau's comments could also cost him further deals with his individual sponsors, with ASICS having an affiliation with the Rugby global.
And the prospect of returning to league where he began his career appears to be closed after Australian Rugby League chairman Peter Beattie stated he would not be welcome in the rival code.
Israel Folau is one of Australian rugby's most highly paid and talented players, but he is also its most controversial.
"Rugby Australia and the New South Wales Rugby Union have made repeated attempts to contact Israel both directly and via his representatives since 6.30pm on Wednesday, and at this point he has failed to communicate directly with either organisation".More news: Uber sets IPO in motion, seeks to 'ignite opportunity'
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'Rugby Australia and the NSW Rugby Union have met with Israel Folau in Sydney today, ' they said in a statement. We will be meeting with Billy to discuss his social media posts, ' an RFU spokeswoman said.
"He (Moses) did reach Israel, however I was unable to speak with him", Castle tweeted.
The multi-million dollar contract Folau signed in February looks certain to be torn up unless he can convince his employers that there are "compelling mitigating factors" for sharing the post.
The devout Christian sparked outrage this week with an anti-homosexual post and caused a stir with his stance on the Tasmanian Parliament passing a legislation to make gender optional on birth certificates and allow people 16 years and older to legally change gender without parental contest.
Folau had just last week become Super Rugby's all-time leading try scorer, and if terminated, he would be unable to complete the season with the Waratahs or play for the Wallabies at the Rugby World Cup. But it seems as though that door has been slammed in the star's face.
Folau's spectacular fall from grace even had the Prime Minister weighing in on Friday.
But rugby bosses said in a statement that while the outspoken player was entitled to his religious beliefs, the way in which he has expressed them "was inconsistent with the values of rugby".
The England global, the son of a Methodist Minister, says people should follow God's teachings more closely.