Rugby World Cup 2019: Newly re-signed Nathan Harris thrives on intense All Blacks competition

While the All Blacks are struggling for first-five cover, there's one position they're well-stocked in for years to come.

Four hookers are contracted until at least 2021, including Chiefs rake Nathan Harris.

Harris called his decision to re-sign with New Zealand Rugby a "no-brainer".

Now contracted for another two years,  he's adding to a welcome headache for the national selectors.

"It only brings the best out of people, so guys like [Dane Coles, Codie Taylor and Liam Coltman], they're all number one in the world," Harris said on Tuesday.

Like Harris, Coles and Taylor are contracted until 2021, while Coltman has signed on for one extra.

It's a far different environment too when Harris first broke into the All Blacks. 

You look back to 2014 and you only had two hookers, so they were sort of scraping the barrel of who they were going to pick and I sort of got picked up there."

Harris has gone on to pay 20 Tests, predominantly off the bench.

But he relishes the competition for a starting spot.

"Three other guys that have all re-signed and that's just an opportunity for me to show my wares and put my best foot forward."

The 27-year old still wants to make the most of the experience around him. 

"I'm growing every day and learning things off them that I wouldn't pick up normally."

While Harris is available to play for the Chiefs against the Hurricanes this weekend after shaking off a knee injury, his Hurricanes counter-part Coles isn't.

Despite being tipped to return, he's still overcoming a calf problem.

That means there won't be a showdown between the two All Blacks on Saturday night as Harris tries to climb up the pecking order.

"I've got unfinished business here and was unlucky to have a few injuries early on in my career."

Harris is hoping his decision to stay will pay off in the long run.