Sasagi started his career at the Knights playing with their S. G. Ball Cup team in 2018,[4] before re-signing with the club on a contract until the end of 2020, with an option for a further two seasons after that.

[5] In 2019 and 2020, he trained with the first-grade squad as a development player,[6] but only played two games for the Knights' Jersey Flegg Cup side in that time after being hampered by injury.

[8] In 2021, Sasagi was promoted to the top 30 squad and spent his time playing with the NSW Cup side.

[12] Sasagi played 14 games for Newcastle in the 2022 NRL season which saw the club missing the finals finishing 14th on the table.

[14][15] Sasagi played ten matches for Canberra in the 2024 NRL season as the club finished 9th on the table.