Fisilau received a scholarship to Caldicott School in Buckinghamshire and developed his skills there before joining Wasps Academy He has brothers called Makobilly and David, and two sisters named Lisia and Malieta.

[3][4] Fisilau came through the academy at Wasps RFC,[5] and also played on loan for Birmingham Moseley Rugby, making his debut against Plymouth Albion at The Brickfields.

[3] Fisilau joined Exeter Chiefs in November 2022 upon the dissolution of Wasps for financial reasons.

[7] Exeter had a long standing interest in the player and coach Rob Baxter suggested they would have made an approach to him even if Wasps had not suffered the financial demise.

[11] Fisilau represented England U20 making his debut in the opening round of the 2022 Six Nations Under 20s Championship against Scotland.