The 28-year-old, who is now signed until the end of 2023, said the decision to stay was an easy one.
"I can honestly say it feels like home. The culture this club has built and continues to build is something very special and I am so excited to be a part of it," he told the Panthers website.
"The energy and love for the game the players and staff bring each day makes it such an enjoyable environment."
Cronulla have signed Dale Finucane on a four-year deal starting in 2022.
