Warren Gatland accepts there will be "no second chances" for Wales if they fail in their World Cup victory mission against Samoa on Sunday.
Samoa are optimistic that fly-half Tusi Pisi will be fit to face World Cup rivals Wales in Hamilton on Sunday.
New Zealand won their second match at World Cup 2011, easily disposing of a hapless Japan 83-7 in Hamilton on Friday.
Canada's team that defeated Tonga 25-20 has been rewarded with another task, as an unchanged line-up was named to take on France in Napier on Sunday.
Italy coach Nick Mallett on Friday announced 12 changes to his side for the World Cup Pool C match against Russia at Nelson on Tuesday.
Samoa coach Fuimaono Tufua on Friday made one change to the starting XV that beat Namibia 49-12 for the Pool C clash with Wales in Hamilton on Sunday.
Georgia coach Richie Dixon kept faith with the bulk of his side when he announced his team to play England in their World Cup clash at the Otago Stadium on Sunday.
New Zealand coach Graham Henry praised an impressive showing by Sonny Bill Williams after the All Blacks' 83-7 World Cup win over Japan.
Quade Cooper's grandmother has leapt to the Wallaby flyhalf's defence after he was labelled a "boofhead" by Australian great Nick Farr-Jones and pilloried in the New Zealand media.
New Zealand routed a hapless Japan 83-7 in their World Cup encounter in Hamilton on Friday - a performance that provided as many questions as answers.
New Zealand coasted to their second successive World Cup bonus point victory as they outclassed Japan 83-7 at Hamilton's Waikato Stadium.
New Zealand maintained their unbeaten start to the World Cup tournament, as the hosts routed a hapless and hopelessly outclassed Japan 83-7 in Hamilton on Friday.
Australia will be out to record their first victory in 25 years at Eden Park in Auckland when they take on Ireland in a key Pool C clash on Saturday.
Argentina will aim to get their World Cup campaign back on track when they face Romania on Saturday in a Pool B game they must win to keep alive their hopes of once again reaching the last eight.
It will be anyone but Australia when Ireland soaks up the majority of the 'neutral' New Zealand support for their World Cup showdown at Auckland's Eden Park on Saturday.