Tamanivalu shifted positions upon moving to the Crusaders, spending most of the 2017 Super Rugby season on the wing.
Tamanivalu was again one of the competition’s highest try-scorers, scoring his tenth of the season to open the 2017 Super Rugby Final against the Lions in Johannesburg on 5 August 2017.
Tamanivalu’s try contributed to the Crusaders beating the Lions 25-17 as they won the competition for the eighth time.
Earlier in the year, on 10 June 2017, Tamanivalu started on the right wing for the Crusaders against the touring British and Irish Lions side, playing the full 80 minutes against the Lions. The fixture was a historic loss for the Crusaders who went down 3-12.