Nasilasila grew up in Namatakula, the famous town known for creating rugby union and league stars like Noa Nadruku who is his uncle,[3] Lote Tuqiri who is his cousin[3] and Nemani Nadolo.

[3] He was spotted by then coach Ben Ryan who saw him playing in one of the local tournaments and included him in his extended side for the 2014 Gold Coast Sevens but an injury ruled him out on the eleventh hour.

[7] He was included by the new Fiji 7's coach, Gareth Baber for the 2016–17 World Rugby Sevens Series.

[8] Nasilasila was selected as the 13th man for the first tournament, of the 2017–18 World Rugby Sevens Series, the 2017 Dubai Sevens but an injury to Waisea Nacuqu on Day One saw him getting selected for the main team and played very well and got praises from the coach after helping Fiji beat the Australia in the dying stages of their final pool game[9] and after Naququ failed to recover in time, he made the main team for the 2017 South Africa Sevens.

His performance in that tournament saw him make the Dream Team for the first time as well as being named the DHL Impact Player of the Cape Town 7s.