Career
A New Zealand and Samoan international, he plays at prop and previously played for the New Zealand Warriors and Sydney Roosters. Matagi served a year in Manawatu Prison, after being convicted of assault. His conviction meant he could not obtain a visa to travel to Australia until 2012.
Following his release from prison, Matagi began playing rugby league.
Matagi was first selected to play for Auckland in 2009. He was selected for the New Zealand Residents in 2009, 2010 and 2011.
Matagi made his debut for the Auckland Vulcans in the NSW Cup on 3 April 2010 but could only play home games for the Vulcans due to travel restrictions. He was named the 2012 New Zealand domestic player of the year.
In early 2013 Matagi joined the New Zealand Warriors squad on a pre-season trial contract.
Matagi was named to make his National Rugby League debut on 11 May 2013 against the Canterbury-Bankstown Bulldogs. On 22 September 2013, Matagi was named at prop in the 2013 New South Wales Cup Team of the Year. Matagi was selected for Samoa in the 2013 Rugby League World Cup.
Matagi showed his NSW cup form in front of the world, scoring 3 tries in 2 games.
In May 2014, Matagi played for Samoa in the 2014 Pacific Rugby League International. On September 2014, Matagi was selected for the New Zealand and Samoa Four Nations train-on squads.
On 7 October 2014, Matagi was selected in the New Zealand Kiwis team final 24 man squad for the 2014 Four Nations series. After only playing one game during the first half of the 2015 NRL season, Matagi requested, and was granted, a release from his contract with the Warriors.
Matagi signed a contract with the Sydney Roosters.
On 4 November 2015, Matagi signed a 1-year contract with the Penrith Panthers, with an option for a second year, starting in 2016.