Reports of the incident came even as England awaited the results of a police inquiry into a fight involving Ben Stokes outside a Bristol nightclub in September.
However, the news immediately brought back memories of Warner's infamous altercation with now England captain Joe Root in the Birmingham Walkabout bar during the 2013 Champions Trophy tournament.
MATT Prior and the United Kingdom press have downplayed allegations wicketkeeper Jonny Bairstow headbutted Cameron Bancroft four weeks ago, accusing Australia of trying to derail England's Ashes campaign.
It's alleged Mr Bairstow headbutted Mr Bancroft, before Bancroft was selected for the test team and was playing for WA.
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The England and Wales Cricket Board has spoken to Bairstow about the allegations.
Following the reports, the European Central Bank issued a statement, saying: "At close of play in Brisbane today, we were made aware of allegations of an incident in Perth four weeks ago". On top of breaking at stumps on day four, with defeat all but certain for the tourists in the first Test, it comes at a time when serious questions are being asked of the drinking culture in the England team.
Claims have surfaced that Bairstow clashed with Australia opener Bancroft outside the Avenue Hotel at the start of the tour Down Under earlier this month.
Seamer Mitchell Starc, meanwhile, has confirmed that Australia would continue to target the fragility of England's tail as his side moved to the brink of a 1-0 lead in the five-match series on Sunday.
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They had arrived in Australia with questions having been raised, including by ex-England opener Michael Vaughan, about their team culture following the barrage of punches thrown by Stokes in the hours after a one-day global against the West Indies in September.
No police report has been filed as of yet and it remains to be seen if the incident will be reviewed by the European Central Bank.
But he was one of three England players fined by the European Central Bank in the wake of a night out in Bristol that saw Ben Stokes arrested for alleged assault.
It's understood the incident was raised on the field during the Ashes opener in Brisbane. We certainly don't want to keep players in their rooms because it is a long tour.
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The protests developed into an armed uprising and a civil war that has killed hundreds of thousands of people and displaced millions.