Coach Dave Rennie has arrived in Christchurch ahead of Saturday's heavyweight showdown with France. Photo: AFP

Coach Dave Rennie said on Sunday he only has time to implement a "simple structure" for his first assignment in charge of the All Blacks, a heavyweight showdown with France.

Rennie's short 10-day preparation time means he'll establish a basic gameplan for their opening Nations Championship Test in Christchurch on Saturday. The former Wallabies coach was named to replace the sacked Scott Robertson as New Zealand's head coach in March but has had little involvement since because of a club contract in Japan that finished this month.

Rennie said he had only coached a handful of the 34-strong playing group previously.

"I'm enjoying it, it's been good getting to know them better," he said, after the team arrived in Christchurch.