The 31-year-old strongman had planned to retire from test rugby after the World Cup, to finish his career in England.
The only other recent example of a player denying the selectors the chance to pick him in a black jersey is Brad Thorn, a lock who became an All Black great for his toughness and exploits during, among other tests, the 2011 World Cup final.
They will begin their campaign next month brimming with confidence, having achieved dominant wins over Fiji, Tonga and the United States to take the Pacific Nations Cup and move up to ninth in the world, matching their highest-ever ranking.
The ground will hold three matches of the men's rugby tournament.
What is guaranteed, though, is that Japan will be no country for young men, particularly when it comes to the high-pressure quarterfinals onwards.
"That comes with expectation, that's just the expectation of being an All Black".
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Japan will open their World Cup campaign against Russian Federation on September 20 in Tokyo where loose forward Michael Leitch will captain the Brave Blossoms for the second successive World Cup. The tournament has also been hosted across Britain and Ireland, France and South Africa.
He ended up playing 59 tests for the All Blacks from 2003-11.
The All Blacks won't have that much experience this year but they will still lean heavily on their "greybeards" when the tournament enters the knockout stages.
Leitch's return from a lengthy injury also helps Japan's cause as it looks to go one further than at the last World Cup.
"The challenges were increasing player depth, to develop players in time for the 2019 World Cup and to create a winning mentality".
"His professionalism both on and off the field has been magnificent over the years, but unfortunately we believe the game requires us to have big mobile number ones and number threes and in this case, we just think the other guys that we've named are more so than he".