Both clubs offered him a trial, however due to FIFA regulations on youth footballers, he was unable to sign an overseas professional contract before the age of 18.

[7][8] By the end of 2018, Lea'i had made his senior debut for Marist scoring four goals across six matches in the 2018 Solomon Islands S-League.

[13] During the beginning of the 2021–22 Solomon Islands S-League season, he was offered a trial with Turkish Süper Lig side Alanyaspor, however Visa issues caused this to be delayed.

[20] In June 2024, after his contract with Velež Mostar expired, Lea'i signed for Adelaide City in the National Premier Leagues South Australia.

He was pivotal to the success of the undefeated Solomon Islands team, helping them sweep aside the competition to take the title as well as qualifying for the 2018 Youth Olympics in Argentina.

Once again, he was crucial to the success of the Solomon Islands team, scoring seven goals in three consecutive 5–0 wins over Papua New Guinea, New Zealand and Vanuatu.

[10] In the 2019 FIFA U-17 World Cup, Lea'i appeared in all three games - against Italy, Paraguay and Mexico - as the Solomon Islands were eliminated in the group stage.