Fifita arrives at Scotstoun following two seasons at New Zealand outfit North Harbour, competing for the Albany-based side in the second tier of the Bunnings NPC.
Standing at 6ft 5in and weighing in at 115kg, Fifita has prior experience of playing in the northern hemisphere; a highly-productive 2018/19 campaign saw him cross for 13 tries in 16 matches for El Salvador, helping the Spaniards to claim the Division de Honor title - the top tier of Spanish rugby.
Fifita made his international debut earlier in 2021, coming off the bench in Tonga's defeat to New Zealand in Auckland before earning a second cap against Samoa in a Rugby World Cup qualifier.
He's the fifth Tongan - and first Tongan back - to represent Glasgow Warriors, following in the footsteps of Ofa Fainga'anuku, Sila Puafisi, Siua Halanukonuka and Fotu Lokotui.