He was born in Ipswich, Queensland, Australia. Moga is of Samoan descent. Growing up in Ipswich, he played his junior rugby league for the Springfield Panthers. He attended St Peter Claver College in Ipswich, where he was the recipient of the 2010 Ronald Holmes memorial trophy as the school's Player of the Year. He represented the Australian Schoolboys in 2010. Moga joined the Sydney Roosters system at age 14. He took the next step and played for the Roosters SG Ball team before being fast tracked into the Toyota Cup team in 2011. Moga turned heads in the competition, scoring 18 tries in 13 games. In late 2011, he would have become the youngest Roosters debutant in 73 years if not for a new NRL rule barring players under the age of 18 from playing first grade.
Playing career
2012
Moga joined the Roosters first grade squad and started the season playing in the Toyota Cup and for the Newtown Jets in the NSW Cup. He was selected for Queensland in the inaugural State of Origin Under 20's match at in the 18-14 loss against New South Wales at Penrith Stadium. In Round 10, Moga made his first grade NRL debut for the Roosters against the Warriors on the, scoring a try in the Roosters 30-26 loss at Mt Smart Stadium. Moga played in 14 matches and scored 7 tries in his debut year in the NRL.
2013
Moga spent the season on the sidelines after suffering two anterior cruciate ligament injuries. One of the injuries happened while playing in a comeback match in the NYC.
2014
On 29 June, Moga joined the North Queensland Cowboys mid-season, signing with them until the end of the 2016 season. In Round 17, Moga made his debut for the Cowboys against the St. George Illawarra Dragons at in the Cowboys 27-24 loss at Jubilee Oval. In Round 21 against the Gold Coast Titans, Moga scored his first try club for the Cowboys in the 28-8 win at 1300SMILES Stadium. Moga finished his first year with the North Queensland Cowboys in the 2014 NRL season with him playing in 11 matches and scoring 3 tries. On 7 October 2014, Moga was selected for the Samoan 24-man squad for the 2014 Four Nations series. On 23 October 2014, Moga alongside Samoa teammates Reni Maitua and Sauaso Sue were fined $10,000 for their involvement in a brawl in at a nightclub at Fortitude Valley. The trio were dropped for 2 matches but later returned to play against New Zealand, Moga making his Samoan international debut on the wing and scoring a try in Samoa's 14-12 loss at Toll Stadium in Whangarei, New Zealand. Moga played in 2 matches in the tournament.
2015
Moga played for the Cowboys in the 2015 NRL Auckland Nines. On 2 May, he played for Samoa in their Polynesian Cup clash with Pacific rivals Tonga, playing at fullback in Samoa's 18-16 loss at Cbus Super Stadium. During the match, he tore his Anterior cruciate ligament, having to undergo a third knee reconstruction, ruling him out for the rest of the year. He finished off the 2015 season early, having played in 6 matches for the Cowboys.
2016
In round 18 of the 2016 season, Moga made his return from injury against the Canberra Raiders. On 24 October, he signed a two-year contract with the Brisbane Broncos starting in 2017.
2017
In July, after playing in 17 matches for the Broncos up to that point, Moga signed a 3-year contract with the Newcastle Knights starting in 2018.
2018
In round 1 of the 2018 season, Moga made his debut for the Knights in their 19-18 golden point extra-time win over the Manly Warringah Sea Eagles. In round 4, he tore his Anterior cruciate ligament while scoring a try in the Knights' 12-30 loss against the St. George Illawarra Dragons, meaning he would miss the rest of the season after facing his fourth knee reconstruction.
Alleged assault
On 11 January 2019, it was revealed that Moga had been charged by police for common assault. The incident took place on Boxing Day 2018 where Moga allegedly slapped a taxi driver twice on the head. According to The Daily Telegraph, Moga and another man allegedly were refused entry into a King Street, Newcastle pub before getting into the taxi. Moga's club Newcastle released a statement saying "The Newcastle Knights were made aware of an incident involving a player on December 26, 2018, The club alerted the NRL Integrity Unit at an appropriate time and are co-operating with the NSW Police. No further comment will be made". In April 2019, Moga was fined $60,000, half of which was suspended, by Newcastle.
