By Phil Harlow BBC Sport at Murrayfield

So'oialo said there was a "lack of focus" from the All Blacks

All Blacks number eight Rodney So'oialo insists the tournament favourites still have plenty of room for improvement at the Rugby World Cup.

New Zealand scored six tries in their 40-0 win against a largely second-string Scotland but a series of try-scoring opportunities went begging.

"There was a tendency to not fully concentrate on basics, like catching the ball," said So'oialo.

"We'll look at it and make sure it's a lot better the next time we play."

So'oialo conceded the errors were down to a "lack of focus" and he added: "We can't afford to make those mistakes in the rest of the tournament."

New Zealand are odds on to win the tournament but doubts persist over whether their relatively straightforward pool - comprising Scotland, Italy, Portugal and Romania - will leave them ill-prepared for the likely challenge of hosts France in the last eight.

But So'oialo stuck resolutely to the party line, insisting that his side had their sights firmly set on Romania's challenge on Saturday.

The better teams will convert some of those mistakes that we made here into points All Blacks hooker Anton Oliver

"Our next game against Romania isn't so easy," said the 28-year-old. "Their forwards are very big and very physical, so we'll concentrate on that before anything else."

Scotland coach Frank Hadden decided to rest several front-line players for the clash with the All Blacks in order to preserve their energies for the pivotal match with Italy on Saturday.

But So'oialo played down suggestions that the relative weakness of Scotland's line-up had cheapened New Zealand's emphatic win.

"We play whatever team comes out in front of us," he stated.

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"We were just there to do what we're good at - and what we've been training to do all week. It's an international team, so they are good enough to be there.

"The Scottish players have a lot of passion, especially at home. All teams have their weaknesses and we did our homework and exploited certain areas.

"But Scotland have a lot of heart and that came through."

New Zealand hooker Anton Oliver admitted the All Blacks would have been punished for their errors by top-rate opposition.

"The first 20 minutes or so was right on the job, everything was done well, but I think we might have to be a bit more structured in the way we play it," he said.

"The better teams will have a better defence and be fast and convert some of those mistakes that we made here into points.

"One of the main attributes that will win this World Cup is making as few mistakes as possible. If we keep on making as many as here then we won't win it.