Foster demands more All Blacks improvement against beefed-up Pumas

New Zealand head coach Ian Foster is demanding further improvement from the All Blacks against an in-form Argentina on Saturday in the first match since his job was saved by his side's rousing win against South Africa.

Foster on Thursday named an unchanged New Zealand team for the Rugby Championship clash in Christchurch, while the Pumas announced a beefed-up backline to meet the physical challenge of the All Blacks.

New Zealand ended a run of three straight defeats with the 35-23 victory in Johannesburg just under two weeks ago.

A few days later the New Zealand Rugby board voted unanimously to retain the under-fire Foster, despite the All Blacks winning just two of their last seven Tests.

"We're clearly wanting to work on that Test being a level for us," said Foster after naming the first unchanged All Blacks starting side for four years.

"Whilst it was a great result, we still know there's a lot of things we could have done better.

"After a strong performance, we want to make sure that we really focus on backing that up and growing from that."

Foster is expecting a stern examination from Argentina, who lead the Rugby Championship standings after two rounds following their 48-17 demolition of Australia in San Juan.

Pumas coach Michael Cheika made three starting changes to add bulk to his backs after choosing to omit a handful of experienced players for the two-Test visit to New Zealand.

Onus on players

Strapping backs Matias Moroni and Lucio Cinti start in place of two seasoned stars -- centre Jeronimo de la Fuente and wing Juan Imhoff respectively.

"New Zealand have a big backline, so we've got some big players there to maybe counter that," said Cheika.

"This team is a combination of what we saw from the last game and the chance