The thrill of Japan's results at the Rugby World Cup continues to excite Sanzar but that is balanced by continuing worries about their entry into next year's expanded Super rugby series.
"We are concerned about any expansion when you bring new teams into a competition and it takes a bit of time for it to bed down," NZ Rugby boss Steve Tew said.
"We are nervous about the strength the Kings will bring to that competition too."
Sanzar had explained why they had gone for the new structure and the rationale behind taking a little bit of a gamble on bringing Japan and Argentina into the competition.
"We are all very excited by what Japan achieved at Rugby World Cup but we remain pretty nervous about their readiness for Investec Super Rugby and that is their next step forward," said Tew.