All Blacks vice captain Ben Smith is expected to sit out eight tests this year.
The Highlanders fullback and captain re-signed with New Zealand Rugby in February through to 2020 and, like many leading players, had a sabbatical clause included in his contract.
Dan Carter and Richie McCaw are just two All Blacks who have exercised sabbaticals previously.
Smith is expected to use his leave option after the second Bledisloe Cup test in Dunedin on August 26, meaning he will miss four further Rugby Championship tests as well as the third test against the Wallabies in Brisbane, and four confirmed end of season games against the Barbarians, France, Scotland and Wales (eight tests in total).
One further mid-week match is expected to be added in France.