This new deal will take the Billinge-born second-row into his third season as a Saint in 2026, and the following two seasons beyond that as well.
“I’m very happy to sign an extension at Saints,” he said.
“It’s been a dream of mine to play for this club, and to be able to do that for another three years means so much to me.
“My goal is to win trophies here, and that’s been the aim since I started playing rugby as a five-year-old. To do it with Saints would be incredible, and that’s what I want to do.”
Over the past two seasons since signing from a five-year spell at Catalans Dragons, Whitley has shown a true team-first mentality by stepping into other positions, such as centre, when needed but his focus is on cementing his spot in the back row under new boss Paul Rowley.
“You have to do what is best for the team at times, which I’m happy to do, but the back row is where I feel most comfortable,” he said.
“I want to make that spot my own, and I’ll do everything I can to make that happen and give Paul some tough decisions.”
A lifelong Saints supporter, Whitley was originally part of the club’s service area programme, which meant he trained and worked with Saints’ youth players and coaches ahead of joining the scholarship programme.
But he began his professional rugby league career by coming through the Academy ranks at Widnes Vikings.
He made his Super League debut with Widnes in 2015, playing there for four seasons and making 100 appearances for the Vikings.
He then moved to the south of France ahead of the 2019 season, developing into a key player for the Catalans Dragons during their rise to challenge for silverware.
The back-rower was part of the side that won the Dragons’ first-ever League Leaders’ Shield and reached two Grand Finals, in 2021 and 2023.
Since joining the Saints, Whitley has made 52 appearances, scoring nine tries for a total of 36 points.