Louie McCarthy-Scarsbrook has agreed an extension that will continue his association with the club for a tenth season.
The 32-year-old has been one of the most popular players at the Saints since he signed from Harlequins in 2011.
He has put pen to paper on a contract that will see him remain in the Red V until the end of season 2020.
“To spend 10 years at this club will be something special,” he said. “It is a privilege to have been here for so long and an honour considering I am not from the area.
“I am really looking forward to hopefully celebrating a Testimonial here and more importantly, winning silverware.”
Louie made his debut for Saints at the ‘Millennium Magic’ against Wigan in 2011 and quickly established himself as a real crowd favourite.
He’s played 247 times for the club, scoring 49 tries, and appeared internationally for Ireland in the 2017 Rugby League World Cup.
“Louie was outstanding for us in 2018,” Saints Head Coach Justin Holbrook said. “He is a really important and versatile member of the squad who is well liked by his teammates and the coaching staff.
“He sets a great example to the younger players in the squad with his work rate and passion and I’m really looking forward to working with him for a further season.”