Louie McCarthy-Scarsbrook has signed a two-year contract extension at Langtree Park.
McCarthy-Scarsbrook, 28, joined from Harlequins ahead of the 2011 season, and has gone on to make more than 90 appearances for Saints, scoring 18 tries.
He said: “I’ve been up here for a few years now and I’m settled. Saints are a great club who want to win trophies and I want to achieve things in the game. I’m hoping I can realise that here. Signing an extension was a no brainer for me really.
“I came north to win things and I’m sure we can do that. I know I am not the finished article and I have to continue learning.
“I put pressure on myself to strive to be the best I can and I’m looking forward to this season and the future.”
The prop is now committed to the club until the end of 2016.
Coach Nathan Brown said: “Louie is a very good player who is popular amongst his teammates. He’s versatile too, as he proved last season, and can play anywhere in the pack.
“He also has a lot of scope for improvement and his career is on the rise.”