Mike Hussey will retire from international cricket after the Sydney test.
His last international appearance will be the New Year's fixture against Sri Lanka at the SCG, starting on Thursday.
He will also stand down from the national one-day and Twenty20 teams.
Hussey's decision to end his career at the end of the Australian summer means the 37-year-old goes out on his own terms and on top, just a fortnight after the emotional retirement of former captain Ricky Ponting.
It also means Australia will be without either of the ageing batsmen for next year's Ashes.
Just last week, Hussey told Fairfax Media he had found it challenging to balance the demands of his young family with the relentless touring of international cricket.
However, he also said former teammates had told him he would know when his time was up, and insisted he was not ready yet. He changed his mind after the Boxing Day test in Melbourne.
Hussey made a late but stunning entrance to international cricket in 2005 and has played 78 tests and made 6183 runs.
The next batsman in line for test selection is Usman Khawaja, who is on standby to play at the SCG if captain Michael Clarke fails a fitness battle.
Hussey, 37, made the shock announcement on Channel Nine Saturday news bulletin.
Hussey averages 51.53. After a form slump two seasons ago, he has returned to vintage form this summer, scoring centuries against South Africa and Sri Lanka.
After he made 115 not out in the First test at Hobart two weeks ago, the Sri Lanka coach Graham Ford said he thought Hussey could do what Ricky Ponting could not, and play on into his 40s.
"It's not beyond him ... he is playing the best cricket of his life," Ford told Fox Sports.
"Just looking at how fit and quick he is between the wickets, that's really impressive at his age. Certainly at this stage he looks like he has a few good years ahead of him.
"The physical condition is the amazing thing for me. You would never believe he is that age the way he is with those quick singles. He is out of the blocks so quickly, he puts in a dive if it's a bit tight.
"He is amazing, it's a super effort. It's good for the game to have him around."
- Sydney Morning Herald
Who's the best test cricket captain?