Rugby: Dan Carter backs Beauden Barrett over Richie Mo'unga in All Blacks No 10 debate

Dan Carter has backed Beauden Barrett to hang on to the much-debated All Blacks no 10 jersey over Richie Mo'unga.

The All Blacks great complemented Mo'unga on his season but said Barrett would be his pick for the coveted first-five position because of his experience and leadership.

"It's obviously hotly debated at the moment and credit to Richie Mo'unga for putting his hand up over a fantastic season," Carter said at Westlake Boys' High School after being unveiled by former Prime Minister John Key as an ambassador for the sports charity ISPS Handa.

"It's hard to go past what Beauden's achieved over the last couple of years. A lot of the All Blacks' success has come because of his performances. He's a leader of the team now."

Barrett, who has 65 test caps to his name, has been one of the best players on the planet for the last few years - winning two consecutive World Player of the Year awards - but hasn't been at his best of late.

Meanwhile, Mo'unga has had an exceptional season for the Crusaders, helping them to a ninth Super Rugby title. It has created calls from some fans and pundits to give the young first-five a shot at the No 10 jersey.

Carter, who held the jersey himself for so long, says the intense competition is a good thing for the team.

"I've been in that position with young guys nipping at your heels. It makes you work harder and appreciate your position in the team more," he said.

"It's great there's competition. Damian's not a bad talent as well. It's great the All Blacks have such depth."