Any move from Jamie Joseph to coach Japan will require significant concessions from that union and his Super rugby bosses at the Highlanders.
Japan host Scotland twice in June when the Super rugby series is on a break and the All Blacks prepare for their domestic three test campaign against Wales.
Joseph could argue that gives him a window to guide Japan in their June 18 and 25 internationals while his Highlanders assistants Tony Brown, Scott McLeod and Clarke Dermody prepare the squad for their return to action.
New Zealand Rugby might have concerns about that arrangement but Joseph's absence for a few weeks would not impact greatly on the Highlanders' match preparations.
They play the Hurricanes away on May 27 and their next match is supposed to be against the Kings on July 2, which would allow Joseph to balance two jobs this season.