The 29-year-old has 11 caps for the All Blacks, after making an eye-catching debut against Samoa in 2017.
A player with immense speed for his size, Fifita will be invaluable at the lineout for Wasps, with his impressive athleticism seeing him make the most lineout steals (22) of any New Zealand player in Super Rugby since the beginning of 2016.
Like current Wasp and former All Black Malakai Fekitoa, Fifita was born in raised in Tonga, before moving to New Zealand for school.
Fifita won the Super Rugby title alongside current Wasps Brad Shields and Jeff Toomaga-Allen with the Hurricanes in 2016.
The 6ft 5in forward has played over 50 games for the Canes, while also appearing for the Wellington Lions with his Wasps teammates.
In June 2017, Fifita started at blindside flanker for the Hurricanes against the British and Irish lions and scored a crucial try with ten minutes left to help the Wellington side draw 31-31.
Fifita was given his first test start for the All Blacks in September 2017, against Argentina. The 111kg forward had one of the standout performances of his career so far, scoring his second test try in spectacular fashion. Fifita sprinted in from 40m, out-running winger, Santiago Cordero and fullback Joaquín Tuculet. He was awarded Man of the Match in the All Blacks' 39-22 win.