Feagai made his debut in round 9 of the 2021 NRL season for St. George Illawarra in their 32–12 victory against Canterbury-Bankstown, scoring a try. Feagai played eight games throughout the season as St. George Illawarra finished 11th and missed the finals.[5]
In round 12 of the 2023 NRL season, Feagai scored the winning try for St. George Illawarra in the last minute of the match as they defeated the Sydney Roosters 24-22 at Kogarah Oval.[9]
Feagai would play a total of 23 games for the club in the 2023 NRL season as they finished 16th on the table.[10]
2024
In round 14 of the 2024 NRL season, Feagai scored two tries for St. George Illawarra in their 56-14 victory over the Wests Tigers.[11] Feagai signed a two-year extension with the club until the end of 2026.[12]
In round 26, he scored a hat-trick in the clubs 44-40 loss against Parramatta. It was the most points scored in a game by a losing team in NSWRL/NRL history.[13]