Palasia is also the eldest nephew of former NRL player and Cronulla Sharks 2016 premiership winning centre, Ricky Leutele (the youngest brother of Keenan's father) who now plays in the English Superleague for Leigh Leopards.

Keenan played schoolboy Rugby League for Palm Beach-Currumbin High School (PBC) from 2010-2014 and was also a part of the 2014 PBC Reds team playing 2nd Row in the GIO Cup Open Schoolboys Qld final winning against Wavell High School alongside Keegan Hipgrave & Jed Cartwright In 2012, Palasia who was in the Gold Coast Titans development system since age 13, played in the under-16s Gold Coast Titans Cyril Connell Cup side as a 15-year-old.

In 2012, he represented the Queensland under-15 Schoolboys rugby league team alongside Jaydn Su'A & Keegan Hipgrave in Darwin.

In 2017, Keenan represented the Queensland under-20 rugby league team under coach Justin Hodges at Suncorp Stadium alongside Brodie Croft, Phillip Sami & AJ Brimson whilst also working in the NRL office under ex-Kangaroos and QLD Origin player David Shillington for the NRL State of Mind initiative co-ordinating awareness presentations to local junior rugby league clubs.

On 7 July 2019, Palasia made his NRL debut for the Broncos against the Cronulla-Sutherland Sharks & childhood friend Briton Nikora.

After a journey to the 2019 Intrust Super Cup grand final, Palasia sustained an ACL tear during 2019/2020 preseason and underwent his 3rd knee reconstruction, sidelining him for the entire 2020 season.