Alex Carey will make his Test debut against England at the Gabba after being confirmed as Tim Paine's replacement.
In a move that had been expected for the last couple of days, Carey has been preferred ahead of Western Australia's Josh Inglis.
Carey has made just 153 runs in eight Sheffield Shield innings this season - with single-figure scores in his last five outings - but did score a century in the Marsh Cup before heading to Brisbane.
He was due to be part of the Test squad for the postponed South Africa tour earlier this year and last season played for Australia A.
"I am incredibly humbled by this opportunity," he said. "It's an exciting build-up for what is a huge series ahead. My focus is on preparing and playing my part in helping Australia secure the Ashes.
"This is also for my dad who has been my coach, mentor and mate, my mum, my wife Eloise, kids Louis and Clementine, my brother and sister and all of those who have supported me. I will be doing my absolute best to make them and our country proud."
Speaking yesterday about his relatively season, Carey said he remained confident in his form.
"I feel like I'm hitting the ball well and although the runs didn't come as I would have liked in the first part of the Sheffield Shield season I think consistently over the last couple of years I've been pretty solid," he told RSN radio.
National selector George Bailey said: "Alex has been a regular member of the national side in white-ball cricket, particularly in the one-day game. He is an excellent cricketer and a fine individual who will bring many great strengths into the team. He will be a very deserved holder of baggy green cap number 461."
Carey's confirmation means there are two selection questions left to be answered before the first Test. Mitchell Starc is expected to retain his place but faces competition from the in-form Jhye Richardson while it is between Travis Head and Usman Khawaja for the No. 5 berth.
Australia's planned three-day intrasquad match has been cancelled due to the poor weather in Brisbane to be replaced by indoor training and potentially some centre-wicket sessions.
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