[2] Pellegrini was born and raised in Sydney, Australia to an Australian father and Tongan mother.
[3] He represented West Harbour in the Shute Shield, Randwick, and the New South Wales under-20 before coming to England to play for Sevenoaks RFC in Kent.
[8] On the 5th August 2024, Pellegrini signed with Super Rugby side, Moana Pasifika for the 2025 season.
He made his international debut for Tonga in a World Cup warm up match against Fiji in July 2023.
He was recalled during the pool stage in place of Otumaka Mausia, who was injured and ruled out for the rest of the competition.