[3] Leilua played his junior rugby league for Hurstville United, before being signed by the St. George Illawarra Dragons.

[10] Leilua made 16 appearances for St. George in the 2018 NRL season as the club reached the finals after finishing 7th on the table.

[13] Leilua made his debut for Wests Tigers against St. George Illawarra in round 1 of the 2020 NRL season at WIN Stadium.

"[17] Leilua played a total of 24 matches for the Wests Tigers in the 2021 NRL season as the club finished 13th and missed the finals.

[19][20] On 14 June, Leilua was granted an early release from his Wests Tigers contract to join the North Queensland side.

[27] On 7 February, it was revealed that Leilua had been suspended from driving and handed a $300 fine in relation to being stopped by Queensland police in January 2024.

It was reported that Leilua registered a blood alcohol concentration of 0.052 at the time and charged him with low-range drink driving.

The North Queensland club released a statement which read "The Cowboys will continue to work with the NRL Integrity Unit on the matter and will make further comment once those discussions are complete".

[28] On 21 February, Leilua signed a three-year deal with St. George Illawarra after being granted an immediate release from his North Queensland contract.