Panthers forward Spencer Leniu has signed a contract extension with Penrith that will see him remain with the club until at least the end of the 2021 season.

“I’m so grateful and humbled by the opportunity to commit my future to the club,” Leniu told penrithpanthers.com.au.

“Panthers has been home for me since I moved from New Zealand, so to continue my journey here is truly a blessing.”

The 18-year-old played for NSW during the U20s State of Origin clash earlier this month, and Panthers General Manager Rugby League Matt Cameron told the club's website he's pleased to get Leniu's signature on the dotted line.

“As a club we are delighted to have a local junior like Spencer in our top 30 squad moving forward,” Cameron said.

“This contract extension is a reflection of the outstanding work ethic that he displays each and every day at Panthers.

“Spencer has already been rewarded with a number of representative honours and we look forward to seeing his game develop further in the years ahead.”