Former England coach Sir Clive Woodward has called Steve Hansen's decision to quit after next year's tournament in Japan "weak".
Woodward, who led England to World Cup glory in 2003, wrote in a column for the Daily Mail that the 2019 World Cup has become "a retirement party for many coaches of the leading contenders", and says it was a huge mistake which could hand Eddie Jones and England the advantage heading into the tournament.
"The All Blacks always seem to make smart decisions on and off the pitch, so I am genuinely surprised by them," Woodward wrote in the Daily Mail.
"Having zero distractions is key and this is a major distraction for the coach, team and country. Players will wonder and continually be asked: "Who is going to be in charge next?".
"I want coaches saying: "I love this job, if you don't want me, fire me". If you're considering stepping down, leave any announcements until after the tournament.