Current head coach Dave Rennie told New Zealand media on Tuesday that he was excited to bring in "avid (rugby) watcher" Henry, who guided the All Blacks to their second World Cup title on home soil in 2011.
"He's very passionate and he loves the jersey. He watches a lot of rugby and he's got pretty strong opinions on players so the conversations we've had have been brilliant," former Wallabies coach Rennie said.
"We're hoping that with his eye, he may see something different to us which will help get the right people within the squad."
Henry coached the All Blacks in 140 matches from 2004-11 before taking roles for a slew of teams, including Argentina and Irish powerhouse Leinster.
He later returned to New Zealand Rugby (NZR) in a technical role for the national women's team, helping steer the Black Ferns to their home Women's World Cup triumph in 2022.
One of Henry's slam-dunk selections will not be available for much of the All Blacks' season, though, as Japan-based Mo'unga finishes his contract for Toshiba Brave Lupus.
Rennie said 56-Test flyhalf Mo'unga had yet to sign a long-term contract with NZR and would need to play for Canterbury in the National Provincial Championship (NPC) to earn the right for selection.
New Zealand Rugby bars overseas-based players from being picked for the All Blacks but some are granted short-term sabbaticals to play in foreign competitions in long-term national contracts.
"He's got his head around it, he's prepared to go and play NPC," said Rennie of the 31-year-old playmaker.
"We've accepted that situation and understand New Zealand Rugby's mindset around it. We'll just get on with it now."
Rennie's hopes of including Japan-based lock Brodie Retallick in his plans have been similarly thwarted, with the former World Rugby Player of the Year baulking at the prospect of a long tour in South Africa, starting in August.
Retallick, who played the last of his 109 Tests in the 2023 World Cup final defeat by the Springboks, has been in outstanding form for Kobe Steelers in Japan's Rugby League One competition, and is top of the try-scoring list as the season winds down.
"I would still say Brodie is the best lock in the world," added Rennie.
"I wind Brodie up about (a Test comeback) all the time. I know he loves the All Blacks and I reckon he's good enough."
