[1] Nankivell's impressive 2019 season caught the eye of the Māori All Blacks selectors and he made his mark on the international stage against Fiji.

In round 5 of the 2020 Mitre 10 Cup Nankivell played his 50th game for the Mako against Bay of Plenty at Trafalgar Park in Nelson in a 33–7 win for the side.

Nankivell had a very strong season for the Chiefs in 2021, playing 12 games and scoring 2 tries as the side made the Super Rugby Aotearoa final.

In round 8 of the 2022 Super Rugby Pacific season, Nankivell played his 50th game for the Chiefs against the Blues.

Nankivell joined Irish United Rugby Championship club Munster on a two-year contract from the 2023–24 season.