19/11/13 England's Kevin Pietersen (L), Johnny Bairstow (2nd from L), Matt Prior and Alastair Cook (R) during training Mandatory Credit: Action Images / Jason O'Brien.
The ECB said in a statement: "At close of play in Brisbane today, we were made aware of allegations of an incident in Perth three weeks ago".
Bairstow was reportedly quick to apologise after the incident, and there is no police involvement or official complaints.
The incident could have implications for Bairstow, who is now in Brisbane for the Ashes tour.
England's Ashes campaign has already been rocked by off-field violence, with vice-captain Ben Stokes withdrawn from their squad following his arrest in Bristol on September 25 after a brawl outside a nightclub.
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It was the first time they had beaten their former star since he departed after they lost all four encounters previous year . And by the time things had ended at the American Airlines Center, it was hard even to remember.
But what we know is that England was in Perth ahead of their Ashes-opening tour match against a Western Australian XI team, and it is alleged Bairstow was out drinking with teammates.
"David Warner had a fair bit to say to him (after the dismissal)", Fox Sports News' Neroli Meadows explained. That case is still pending with investigation being conducted by both police and European Central Bank. Despite the controversy, no ban on alcohol was placed during the Ashes but players decided they would not drink in the immediate lead-up to matches. Bancroft was not a member of the Australia squad at the time.
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.
"There are no set curfews, they are just sensible rulings", Bayliss said shortly after arriving in Perth.
"Not drinking between matches is just sensible".
Bairstow was apparently sledged by the Australian players, which also invited a send-off from Australia vice-captain David Warner after Bairstow was dismissed for 42. You have to get out and experience what the country you're touring has to offer.
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