Former All Blacks captain Richie McCaw hit rock bottom in 2007 but credits Dr Ceri Evans for giving him the mental tools he needed to succeed.

All Blacks great Richie McCaw would like to see a stop-clock govern scrums to stop the time wasting that blights rugby.

The double World Cup winning skipper has done a quick question and answer session with fans for World Rugby and was asked what rule change the governing body could implement to help the game.

"One of the things I get a bit frustrated by is the way a scrum can eat up a lot of time in the game," McCaw said.

GETTY IMAGES Richie McCaw is frustrated at the amount of time wasted during scrums in rugby games.

"If I was going to change something it would be to stop the clock when awarding a scrum and it starts again when the ball comes in. You'd get quite a bit more rugby."

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As the All Blacks get set to operate under new coach Ian Foster, McCaw says he has no serious coaching ambitions at the top level.

STUFF Richie McCaw enjoys coaching rugby to children.

"I think I'd just get too frustrated," he said.

"As a player I could get out there and do something about it. But when you are a coach I think you have to have a different way of looking at it. But I'd like to coach young kids one day."

Asked who the most inspiring and hard-working All Black he had played alongside was, McCaw didn't hesitate to nominate his good friend Dan Carter.

GETTY IMAGES Former All Blacks captain Richie McCaw delivered the Webb Ellis Cup to the opening ceremony of the recent Rugby World Cup in Japan.

"The amount of work he used to put in to make sure he was right to play on Saturday meant everyone around him made sure they were doing their little bits. Having hio direct things around the field made things pretty easy as a No 7."

You asked. Richie answered!



Richie McCaw on everything from his toughest opponent to his thoughts on Faf's hair... 👇 pic.twitter.com/A5STrMtWR8 — Rugby World Cup (@rugbyworldcup) December 16, 2019

In terms of his most respected opponent, McCaw opted for Wallabies flanker George Smith.

"He was pretty tough and I played him regularly throughout my career," McCaw said, adding that his favourite back row combination was playing alongside Kieran Read and Jerome Kaino.

McCaw has lost considerable weight since he retired after winning the 2015 World Cup and immersed himself in adventure racing.

The 38-year-old laughed off any suggestions of a comeback, saying: "I'd last about 20 seconds I reckon before I was broken these days."

GETTY IMAGES Richie McCaw joked that long-haired Springboks halfback Faf de Klerk "does a bit of time in front of the mirror".

And he had a wee crack at one of the current characters of international rugby, Springboks halfback and 2019 World Cup winner Faf de Klerk.

Asked what he thought about the tiny halfback's trademark long blonde hair, McCaw couldn't resist.

"He's a back so he obviously does a bit of time in front of the mirror before he gets out there. As a forward we probably just wish we could do the same."