The Six Nations would be too long with Japan involved as a seventh team, says Eddie Jones. But he is open to playing the Brave Blossoms.
New Zealand are still on the hunt for a new head coach but Jamie Joseph will not be taking on the role.
Scottish Rugby will not challenge the punishment handed out by World Rugby last week.
After their heavy defeat in the Rugby World Cup final, England have confirmed they will return to Japan for two Tests in 2020.
Scottish Rugby will consider its options, which may include arbitration, after being sanctioned by World Rugby.
There were four All Blacks and as many Japan players in the Opta team of the Rugby World Cup, but no world champions.
World Rugby chairman Bill Beaumont commended Japan for staging a tournament that "has changed the face of rugby forever".
All of the Rugby World Cup semi-finalists and Japan have been represented in World Rugby's nominations for the 2019 team and coach awards.
After big wins over Australia and Japan respectively in the Rugby World Cup, England and South Africa moved up in the world rankings.
South Africa were nervy at half-time but finished with a flourish to beat hosts Japan and set up a Rugby World Cup semi-final against Wales.