USA coach Eddie O'Sullivan revealed that the RWC schedule was hard on the so-called minnows in New Zealand in September.
Namibia coach Johan Diergaardt took a parting swipe at the RWC schedule after his side's fourth heavy defeat at the tournament.
Wales recovered from an indifferent second quarter to dispose of Namibia 81-7 in their Pool D encounter in New Plymouth.
Wales will expected to bag a full house of points against a battle-weary Namibian side in their World Cup clash in New Plymouth on Monday.
Namibia coach Johan Diergaardt has made three changes to his starting XV for their final match at the RWC, against Wales on Monday.
Bryan Habana scored a record-breaking try as South Africa cruised to an emphatic 87-0 World Cup win over Namibia on Thursday.
Namibia captain Jacques Burger and his charges are relishing the chance of facing South Africa in Auckland on Thursday.
SA will be out to get maximum points against Namibia when the African neighbours go head to head in North Harbour on Thursday.
Namibia coach Johan Diergaardt has made six changes in this line-up to play South Africa in their World Cup Pool D match.
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South Africa are in arguably the toughest World Cup pool with four teams boasting credentials worthy of filling the two quarter-final berths.