Speaking at a fundraiser dinner on Monday night, Hansen was asked what he thought of former Wallabies player Mark Ella's jibe that "Mickey Mouse could coach the All Blacks to victory", due to New Zealand's rich pool of talent.

Hansen reportedly bit back, saying "they've got Mickey Mouse coaching Aussie", before claiming Cheika was "not a bad bloke, (but) he's got to control his emotions".

The All Blacks mentor, who will step down following this year's World Cup, is understood to be livid the throwaway line was made public.

Mitchell, a veteran of 71 Tests, wasn't about to let him off the hook though, saying the comments went against everything the All Blacks had stood for.

"You hear the stories about them sweeping out the sheds and things like that - they've been the pinnacle of the game on and off the field," he told AAP.

"It's disappointing to think perhaps that a boozy lunch, where he thinks things will be kept in house, that that may be their true opinion.

"When everyone's watching he'll say what everyone wants to hear, but when it's behind closed doors in an environment where they think no quotes will be taken, then it comes out."

Mitchell anticipates Cheika will allow the banter to go through to the 'keeper as he prepares for a World Cup in the absence of sacked assistant coach Stephen Larkham.

The former winger said it was a necessary move to rid "the opportunity for any ambiguity" but warned them not to arrive in Japan as one trick ponies.

"They needed to do it if the head of the attack and backs coach isn't on the same page as the head coach - the players will be getting mixed messages," he said.

"But you can't go into a World Cup with just one style of play.

"You've got to have that capacity to play expansively when the opportunity presents or tighten it up to play the clock."

Australian Associated Press