[citation needed] Harris played his junior football for the Tamatea rugby union club and attended Hastings Boys' High School before being signed by the Melbourne Storm.

[4] Harris was called up to the New Zealand national rugby league team squad as 18th man for the 2013 Anzac Test, replacing Jeremy Smith.

Harris was promoted to the playing squad on the day of the test match when captain Simon Mannering was ruled out with a calf injury and made his debut for New Zealand on 19 April 2013 in the Kiwis 32-12 loss against Australia.

The decision was made following the controversial change of mind of Sonny Bill Williams, who had previously ruled himself out of the competition, to join the squad.

[7] Harris turned down a position to tour with the squad and play in a pre-tournament match against the Cook Islands in order to have minor surgery and rest before the 2014 NRL pre-season began.

[12] In the 2014 Anzac Test, Harris was selected to play off the interchange bench but was shifted to start at five-eighth over debutant Isaac John.

[19] In July, the Storm played the first ever NRL game at McLean Park in Napier, New Zealand, against the St George Illawarra Dragons.

[34] He made his first appearance of the season in Round 10 against the Gold Coast Titans, in a shock 38-36 upset loss at Suncorp Stadium.

[35] On 1 October, in the Storm’s 2017 NRL Grand Final against the North Queensland Cowboys, Harris started at second-row and had a blinder of a performance in the 34-6 victory.

After the grand final victory, Harris was ruled out of the 2017 Rugby League World Cup due to niggling shoulder and foot injuries.

[38] In Round 1 of the 2018 NRL season, Harris made his club debut for the New Zealand Warriors against the South Sydney Rabbitohs, starting at second-row in the 32-20 win at Perth Stadium.

[42] Harris played 23 matches for the New Zealand Warriors in the 2023 NRL season as the club finished 4th on the table and qualified for the finals.