[2] The Borlase family moved to Melbourne several months after he was born and relocated to Adelaide around four years later,[2] settling in the suburb of Netherby.
[3] He made the under-15 All-Australian team and played in the under-17 futures game at the MCG on 2019 AFL Grand Final day.
[1] In 2020, Borlase made his senior debut for Sturt in the South Australian National Football League (SANFL).
[3] He also earned best on ground honours in Prince Alfred College's 2020 All Schools Cup grand final victory.
[3] Although his father Darryl played 246 games for Port Adelaide in the SANFL, Borlase was ineligible to be a Port Adelaide father-son prospect because Darryl fell short of the required minimum of 200 matches before the club's Australian Football League (AFL) entry in 1997.