Mark Robinson accepts New Zealand Rugby made mistakes with the way they handled uncertainty over All Blacks head coach Ian Foster's future.

The NZ Rugby board on Wednesday gave Foster their "full support" to stay on until the Rugby World Cup in France next year and appointed Joe Schmidt as his assistant.

That announcement came just a few days after NZ Rugby chief executive Robinson stated that the governing body would "take stock" and hold a debrief following a 35-23 Rugby Championship win over South Africa on Saturday.

The win over the world champions at Ellis Park came after the All Blacks had suffered five defeats in six Tests and sunk to a new low of fifth in the world rankings.

Robinson had only guaranteed that Foster would remain head coach for the tour of South Africa and he admits NZ Rugby did not handle the situation as well as they could have done.

"We acknowledge we haven't got everything right, we're not hiding from that," he said during a press conference in Auckland.

"Aspects of the sequencing in how we interacted with media and the public is something we could have done differently."

Robinson added that "clearly some aspects of the interface between the media and the public wasn’t as good as it could be."

He also conceded: "There's a few things we've done in recent times that could have been done better."

Robinson felt NZ Rugby had a difficult balancing act.

He said: "People want to hear what's going on, they want engagement and access and openness. When you attempt to achieve that, but you're not in a position to really say a lot, then the flip side is you are criticised for doing that. We are always learning.’"

When asked if stating that NZ Rugby would "take stock" following the win in Johannesburg last weekend added "fuel to the fire", Robison replied: "Hindsight's wonderful, isn't it?

"We were attempting to respond to a general demand to be want to be more open and want to be more transparent and give as much as we can possibly can at a time when people are curious, and we don't always make the right decisions.

"It's difficult, isn't it, if you don't say things and think of the best interests of the team and wait till they're out of the country, you're criticised for going missing in action.

"But if you turn up and do have something to say when you're not in strong position to say a lot of things, you get criticised for having to be in a position where you're not saying anything."

Ian Foster is staying on as New Zealand head coach and Joe Schmidt has been appointed as his assistant.

Foster had been under huge pressure following a dismal run of five defeats in six Tests, before the All Blacks lifted the gloom with a 35-23 Rugby Championship win over South Africa at Ellis Park on Saturday.

New Zealand Rugby chief executive Mark Robinson had only guaranteed Foster would remain in the role for the two Tests against the Springboks.

Robinson stated after the victory over the world champions in Johannesburg that the governing body would "take stock" and hold a debrief, with Foster saying he expected to retain his job.

NZ Rugby on Wednesday confirmed that the 57-year-old will be in charge through to the Rugby World Cup in France next year, with Schmidt taking on a full-time role supporting him.

Stewart Mitchell, the NZR chair, said during a press conference in Auckland: "[The board] have unanimously agreed they have absolute confidence that Ian and this coaching group are the right people to lead the All Blacks through until the World Cup.

"This has been privately and publicly validated by our players and various conversations with our high-performance team."

Former Ireland head coach Schmidt had already been working in the All Blacks' set-up and Foster welcomed his appointment.

"Joe Schmidt has been on my radar, probably for a couple of years," said Foster.

"We flagged at the start of this year that his role was to join us after the Irish series as an independent selector to replace Grant Fox and in addition he was going to do some opposition analysis work and work alongside myself in the strategy area.

"We started that after the Irish series [which Ireland won 2-1] and delighted with how that's going. I have a great relationship with Joe."

Holders New Zealand are back in Rugby Championship action against Argentina at Orangetheory Stadium a week on Saturday.

Joe Schmidt will help New Zealand prepare for the first Test against Ireland at Eden Park on Saturday after head coach Ian Foster and two of his assistants tested positive for COVID-19.

Foster and assistant coach John Plumtree tested positive for coronavirus at the weekend and Scott McLeod is the latest coach to contract the virus.

Former Ireland head coach Schmidt will work with the New Zealand squad this week in the absence of that trio.

Centres David Havili and Jack Goodhue have also tested positive for COVID-19, so Braydon Ennor has been called up to join the squad in Auckland.

Foster said: "Joe will come in for Tuesday and Thursday's training this week, and we're really grateful to have his help.

"We've planned for this kind of disruption and we've got back-up plans and people on standby.  Joe was one of those people we could call on."

Foster added: "I've got every confidence in our coaching group, and in our senior leaders who are all stepping up in what’s a massive test for us.

"Everyone has had to deal with these kinds of disruptions over the past couple of years. This is a real opportunity for the coaching group and team to pull together."

Former Ireland head coach Joe Schmidt has agreed to replace Grant Fox as an independent New Zealand selector.

Fox will step down from the role after the Steinlager Series next year, having been a selector for a decade.

Schmidt will take up his position with the All Blacks and assist in selecting the squad for the Rugby Championship after finishing his part-time duties working with the Blues in the Super Rugby Pacific competition.

New Zealand head coach Ian Foster said Schmidt is a shrewd appointment.

Foster said: "Joe will bring a wealth of New Zealand and international experience into the role, so we are delighted to have him join us.

"He will work closely with me and ‘Plums’ [ fellow selector John Plumtree] on selections but his insights will be valuable in other areas as well, so we look forward to having him join us."

The experienced Schmidt said: "It's humbling to be involved and I'm looking forward to learning more about the players and the All Blacks environment and helping out as best I can."