 Tu'ungafasi went on to replace Joe Moody off the bench in both the Bledisloe Cup-winning 36-0 victory over Australia, as well as a 92-7 win over his native Tonga.On 28 August, All Blacks Head Coach, Steve Hansen, named Tu'ungafasi as one of 31 players in New Zealand's squad for the 2019 Rugby World Cup.Tu'ungafasi and his father, Mofuike, joined the group of fathers and sons to play at a Rugby World Cup, including the likes of Wales' Ross Moriarty and France's Romain Ntamack, whose fathers had also previously appeared at World Cups.