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Barrett will now face the judiciary after he was adjudged to have shoulder charged Wallabies skipper Michael Hooper by referee Jerome Garces at the end of the first half at Optus Stadium last night.
The All Blacks were forced to play with 14 men and the Wallabies capitalised, winning 47-26.
Barrett faces a ban of probably between four and six tests. The All Blacks have two tests remaining before they face South Africa in Yokohama on September 21, and four pool games in total before the knockout matches.
And they are now no longer the top side in world rugby. Wales have unofficially taken that honour following Australia's win. The All Blacks have provisionally slipped off the top spot for the first time in 10 years.
"Our discipline was poor in the first half. There were numerous occasions when we got offside when we didn't need to.
"It was dumb footy and we've got to be smarter than that.
"Our changing shed is very disappointed because of how we performed and that's how it should be. Australia gave us a lesson in what to do when you have a side down by one man.
"At the same time I'm extremely proud of the way they hung in. Australia wanted to play footy, they wanted to play fast. In the end we couldn't cover the extra space."
"You don't want to be pre-judge things at this point. We'll have to look at video to see if there were any mitigating circumstances."
He added of the record 47-26 defeat which came after Australia enjoyed 80% possession the first half: "I know the scoreboard is pretty massive - 47 points, we don't normally have that score put against us.
"I don't think we can beat ourselves up about our defence in the second half. There was plenty of effort. We were just up against a side who found plenty of space."
Skipper Kieran Read said: "They did really well to take advantage of us being a man down."
Patrick Tuipulotu or Jackson Hemopo will now come into the frame to start alongside Sam Whitelock in the second row in the return match against the Wallabies at Eden Park in Auckland next Saturday.
A win for the Michael Cheika's men would see them reclaim the cup.
Such was Garces' dramatic intervention it was difficult to get a read on whether the All Blacks improved much on their previous two tests of the year or not.
There were promising signs from the Ardie Savea/Sam Cane loose forward double act, and that pair combined with Kieran Read's defensive nous close to the ruck was becoming increasingly influential as the visitors sought to up the pace via a game based on tempo and width.
In fact, Savea was one of the All Blacks' best, a man who managed to be a menace around the ruck and near the sidelines with the ball too, an all-round game that requires massive amounts of endurance and commitment; two things he has plenty of.
There was good stuff again from Richie Mo'unga and Beauden Barrett, too. The former was creative and the latter deadly near the line.
Second-five Anton Lienert-Brown was decisive and dangerous, as was Ngani Laumape when he replaced the injured Jack Goodhue at the end of the first quarter.
Rieko Ioane bounced back with a much-needed try and a more confident performance, but if there is a lingering concern as far as the backline is concerned, it must be right wing Ben Smith, a veteran in his final year still searching for form after a difficult season at the Highlanders.
- By Patrick McKendry in Perth