Career
Loko is of Fijian and Tongan descent. Loko was raised in Claymore, New South Wales (a small suburb in Campbelltown), Loko began playing junior rugby league for Campbelltown City and Eagle Vale, while also attending Eaglevale High School. Loko then moved to Westfields Sports High School playing junior league with the Cabramatta club and Allsaints Toongabbie, before completing his senior year at The Hills Sports High School.
2010-2014: Career with Parramatta
During Loko"s senior year in high school Loko performed strongly on the Parramatta Eels South. G. Ball Cup squad, which earned him a place in the National Youth Competition team
Loko has played 16 games for the Parramatta Eels" National Youth Competition team over the 2010 and 2011 season, in which he has scored 7 tries including a hat-trick against the South Sydney Rabbitohs. Loko made his debut for the Parramatta Eels in round five of the 2011 NRL season against the Melbourne Storm where the Parramatta Eels were defeated 38–0.
He suffered a torn anterior cruciate ligament (Anterior Cruciate Ligament) in the Round 17 game against the Brisbane Broncos. He was ruled out of the remainder of the 2011 NRL season and was hoping to return to first grade in 2012.
In the 2012 preseason, Loko sustained another knee injury whilst boxing.
He was once again ruled out for the remainder of the season. 2014-present: Career with Bulldogs
On Wednesday 2 2014, The Bulldogs have moved to shore up their outside backs stocks with confirmation they have signed promising Eels centre Jacob Loko, effective immediately. According to Bulldogs club legend Terry Lamb, Loko has the same physical traits and dimensions as a young former Bulldog Sonny Bill Williams.
On 2 January 2015, Loko was arrested and charged for high-range drink driving, with a blood alcohol level almost four times above the legal limit.