Son of former All Black Marty Berry, Rocco made the surprise move to the Warriors after starring in First XV rugby for St. Patrick's Silverstream College in 2019.
Having made his NRL debut this season, the 19-year-old has already impressed the Warriors management enough to earn a contract extension through to 2024.
"I've grown up being a Warriors fan and to have my future here sorted it's something I can't wait for," Berry said.
