Playing Namibia will be exactly the same as playing South Africa, England or any other rugby heavyweight and the All Blacks were treating their Pool B clash with the lowest-ranked side at the World Cup as such, center Anton Lienert-Brown said on Saturday.

The All Blacks are expected to comfortably account for the southern Africans at Tokyo Stadium on Sunday and put one foot in the quarterfinals.

The three-time world champions are projected to win Pool B but could still be pipped in the more than unlikely event that Italy records its first victory over Steve Hansen's side next week in Toyota, Aichi Prefecture, with a bonus point.

New Zealand highlighted its ruthless streak when it ran in nine tries against Canada in Oita on Wednesday to record a 63-0 victory, the highest score at the tournament so far and Lienert-Brown said the All Blacks are likely to be as focused on Sunday.

"Every week is the same. The biggest (lesson) for me over the years is that my personal standards matter the most," he told reporters.

"It doesn't matter who we come up against, it's about me playing to the best of my ability. Whether that's South Africa, Namibia, England or whoever it is.

"It's important that you go out there and you have prepared yourself to the best you can to perform for the team.

"We have prepared very well for this game, just like we have prepared for South Africa."

Lienert-Brown will join Jack Goodhue in the centers for the third different midfield combination in the tournament.

Goodhue played for 40 minutes against Canada, after recovering from a hamstring injury, with Sonny Bill Williams, while Ryan Crotty and Lienert-Brown played together against the Springboks in the opening match.

After years of stability in the midfield with Conrad Smith and Ma'a Nonu playing more than 60 tests together, Hansen has chopped and changed his squad during the current World Cup cycle and never settled on a first-choice combination.

Assistant coach Ian Foster, however, said there was no great mystery as to what was the preferred combination, with game plans and opposition proving the defining factor.

"We've always said we've got five great midfielders," Foster said, including Ngani Laumape in the mix.

"Through chance or injury or selection over the last couple of years, we've mixed and matched the combinations for a reason and we're delighted with whatever options we've got.

"We've got different strengths, different players, and we're excited about this one.

"We've got some great options."