Tallis Duncan earned a place in the RLPA Dream Team of the Year's second row for 2026 after fellow NRL players voted for him.
South Sydney have extended the 24-year-old's contract by three seasons, keeping him at the club until the end of 2030.
Since making his NRL debut in Round 13 of 2023, Duncan has played 73 matches and scored 24 tries.
Though he broke through as a middle forward, he has also impressed in the second row and at centre.
His toughness, skill and game sense have fuelled expectations he could become a NSW Blues representative.
His representative record includes two Indigenous All Stars selections, two Prime Minister's XIII appearances and a Test for Malta in 2022.
"I'm really happy to be staying at Souths. I love this club, and this is my home," Duncan said in a Rabbitohs statement.
"I've grown a lot since I first came to the Club and I'm grateful for everything Souths has given me. I'm looking forward to continuing that journey here.
"Putting on the Souths jersey means a lot to me, and I'm excited for what's ahead."
Rabbitohs Head of Recruitment Mark Ellison praised Duncan's work ethic and prospects.
"Tallis is one of the most exciting prospects in the NRL, and we're delighted that he sees his future here at this Club," Mr Ellison said.