2019 Dargan made his international debut for the
Cook Islands against
South Africa in a
2021 Rugby League World Cup qualification match. He scored a try in that match as the Cook Islands won 66–6. He also scored two tries in his second match against the
United States as the Cook Islands won 38–16. In August 2019, the
South Sydney Rabbitohs announced that Dargan had joined the club on a two-year contract.
2020 Dargan made his debut in round 3 of the
2020 NRL season for South Sydney in their 28–12 loss against the
Sydney Roosters following the resumption of the sport due to the
COVID-19 pandemic.
2021 Dargan made no appearances for South Sydney in the
2021 NRL season. Dargan's contract was not renewed by South Sydney.
2023 Dargan joined Manly's reserve grade side the
Blacktown Workers Sea Eagles ahead of the 2023 NSW Cup season. He played a total of six games for the club. On 11 November, Dargan signed a contract to join
Canberra ahead of the
2024 NRL season. ==Death==