[5] When he was 14 weeks old, his family moved to Widgee, Queensland, where he attended James Nash State High School, Gympie.

In 2016, Fa'asuamaleaui played for the Central Crows in the Cyril Connell Cup and was selected to represent the Queensland under-16 side.

[17] After the grand final, he was rewarded by making his Queensland Maroons debut in the 2020 State of Origin series Game 1 at the Adelaide Oval.

[18] He made his club debut for the Gold Coast in round 1 of the 2021 NRL season against the New Zealand Warriors.

[19] He played 23 games for the Gold Coast in the 2021 NRL season including the club's elimination final loss against the Sydney Roosters.

[20] On 23 November, he signed a $3.3 million contract extension to remain at the Gold Coast until the end of the 2026 season.

[29] Following the Gold Coast's 25-24 loss against Parramatta in round 20 of the 2023 NRL season, Fa'asuamaleaui was suspended for three matches over an illegal shoulder charge.

[31] He played a total of 19 matches for the Gold Coast in the 2023 NRL season as the club finished 14th on the table.