He previously played for the Newcastle Knights in the NRL, as well as the Prime Minister's XIII and World All Stars at representative level.
[14] In round 23 against the New Zealand Warriors at Hunter Stadium, he scored his first NRL career try in a three try effort for Newcastle during their 28-22 win.
[23] Late in September 2014, he signed a letter of intent to join the Canterbury-Bankstown Bulldogs on a four-year contract starting in 2016, along with his brothers Chanel and Pat.
[24][25] However, the NRL's rules didn't allow Canterbury to register the contracts until 30 June 2015, leaving the option of staying at Newcastle open for the Mata'utias.
[43] On 14 July, Mata'utia was suspended for two matches and missed St. Helens Challenge Cup final victory over Castleford.
[48] In April, Mata'utia was knocked out during St Helens loss against arch-rivals Wigan where he remained motionless on the pitch for almost ten minutes and required oxygen.
[49] In the 2023 Challenge Cup semi-final, Mata'utia was controversially sent to the sin bin during St Helens 12-10 loss against Leigh.
He played in St Helens narrow loss against the Catalans Dragons in the semi-final which stopped them reaching a fifth successive grand final.
[52] He played 21 games for St Helens in the 2024 Super League season which saw the club finish sixth on the table.
Mata'utia played in St Helens golden point extra-time playoff loss against Warrington which was also his last game for the side.
[54] On 6 Nov 2024 it was reported that he, alongside his brother Peter, had signed for Newcastle Rugby League side Lakes United Seagulls[55]