There's been a bit more added to the article since the news broke...
Stuff understands that the All Blacks are bracing for more disruption, with the very real potential for other members of the playing and/or coaching groups to join the defections.
The All Blacks had been building up with a camp in Northland last week, but the loss of their two most senior coaches threatens to throw their preparations into disarray.
With Foster and Plumtree both out for the week, the All Blacks will be in the hands of remaining coaches Scott McLeod, Greg Feek and Brad Mooar. It is not clear whether former Ireland coach Joe Schmidt could potentially step in this week.
The experienced head coach is due to join the All Blacks setup after this series as a selector and has worked with the Blues throughout their Super Rugby Pacific campaign.
Foster said he was confident in the team’s ability to carry on preparing for the first test without the absences causing too much duress.
“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,” he said.
"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."