Korbin Sims has signed a deal to keep him at Newcastle for the next two NRL seasons.
The 23-year-old, the youngest of rugby league's three Sims brothers, made his first grade debut in 2013 and has since played 33 games in red and blue.
"Korbin has shown us the key attributes we are looking for both on and off the field, and we know his future is bright here at the Knights," said Newcastle chief executive Matt Gidley.
Tariq Sims also plays for Newcastle, while Ashton Sims, the eldest brother, plays for Warrington in the Super League.
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