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In further disruption for the All Blacks, Crusaders midfielders David Havili and Jack Goodhue have also been removed from the team due to Covid. Crusaders centre Braydon Ennor has joined the squad as cover.
Schmidt coached Ireland from 2013-19 – a period that included their first win and maiden home victories against the All Blacks – before returning home last year. Schmidt's intimate knowledge of Ireland's senior players and management (Irish head coach Andy Farrell was his assistant) is sure to prove valuable.
Losing their most experienced coaches causes significant disruption for the All Blacks, however.
Given the seven day isolation period assistant coaches Brad Mooar and scrum coach Greg Feek, alongside Schmidt, will largely assume the reins.
Havili was expected to start at second five-eighth alongside Rieko Ioane in the All Blacks midfield but Quinn Tupaea may now benefit from his and Goodhue's respective absences.
Roger Tuivasa-Sheck also now looms as potential bench cover, although the All Blacks could prefer fellow test rookie Leicester Fainga'anuku.
In a statement from isolation, Foster said he is confident in the team's ability to carry on preparing for the first test.
"We've had a plan for this happening, and it's a great opportunity for the wider coaching group and the senior players, who will be highly motivated to step up.
"We have learned how to cope with the unexpected, like everyone has over the past couple of years. I will still be working alongside the coaches and team via Zoom and I have huge faith in the coaching group and the players.
"We have structures in place and everyone is working together."