 Tu'ungafasi was one of only three Blues players selected, alongside backs Rieko Ioane and Sonny Bill Williams.Tu'ungafasi replaced Owen Franks off the bench in all three tests against France, with his most notable involvement in the series being the second test, a 26-13 win over France on 16 June 2018.Tu'ungafasi replaced Franks in only the 34th minute, with Franks failing to scrummage to the referee's standards.