The 28-year old has made 157 NRL appearances all for South Sydney and was a part the side’s 2014 premiership triumph.
Clark has come off the bench for the 9-4 Rabbitohs this season who sit third on the NRL ladder, but is happy to lock down his future in England’s Super League and is excited for what lies ahead.
“I’m glad to have my contract organised with Warrington and I’m looking forward to the next chapter in my career over in England, but first we have a job to finish here at Souths,” Clark told rabbitohs.com.au.
“The past 11 seasons have been a young boy’s dream come true. All I’ve done is wear the red and green, and following discussions with Steve Price, Simon Moran and Karl Fitzpatrick, I’ll be able to extend my career in the primrose and blue of Warrington.
“Warrington is a similar club to us here at Souths. They have a long and rich history which is something that attracted me to the Club.
“I’ll also be able to team up with (former Rabbitohs team mate) Bryson Goodwin and his family which is exciting for me, my wife Lauren and my three daughters Milla, Andi and Billie.
“I can’t thank everyone connected with the Club enough for the opportunities I have been given to play for this team.
“I want to thank all of my team mates, coaches, the staff and management, sponsors and of course our brilliant Members for all of their support over the years, including everyone from Souths Juniors and those who helped me become an NRL footballer. It means so much to me and my family.
“I’m so lucky to have received the support that I have and I’ve made friendships that will outlast my playing career. They will last for a lifetime. Some of my biggest supporters are my mum and dad and my sisters so I thank them as well.
“As I said, I’m looking forward to the next chapter, but my focus remains with the Rabbitohs for the rest of this season.
“We have many things still to achieve this year and that all starts with Friday’s game against the Titans.
“I cherish every game I get to play and I’m looking forward to playing out the rest of this season in front of our loyal Members and supporters.”
Rabbitohs GM of Football Shane Richardson wished the veteran all the best ahead of his move.
“Jason has been simply an outstanding club man, always giving his best and always with a smile on his face,’ Richardson told rabbitohs.com.au.
“He will be welcomed back to the Club in some capacity in the future when he finishes his playing career.
“Warrington is a great club and they have signed a quality player and human being.”