The contract extension means the 22-year-old Fijian international will remain with the Panthers until at least the end of the 2019 season.
“I’m really excited to re-commit to the club and I’m very thankful for the Panthers giving me this opportunity,” Kikau said.
“I know there are challenges ahead but I am looking forward to them.”
After scoring 32 tries in 42 Holden Cup games for North Queensland Cowboys, Kikau joined the Panthers ahead of the 2016 season.
Off-season ankle surgery slowed his progress and Kikau’s first year at the Panthers was spent building form and fitness in the Intrust Super Premiership NSW competition.
His highly-anticipated NRL debut came in Round 2 this season, with the young prop scoring a memorable try against Wests Tigers at Campbelltown Stadium.
“We are delighted Viliame has committed to another two seasons with the Panthers,” Executive General Manager Rugby League Phil Gould AM said.
“Viliame has outstanding potential and is a very popular member of our club.
“His best football is undoubtedly in front of him and we look forward to his future development.”