The club granted him a release from the final year of his contract this morning.
Mata’utia is set to play in the Newcastle Rugby League premiership next season.
The 25-year-old played 13 NRL games in four seasons for his home club.
“The Club has been great to me and I will miss everyone, but it is the right time for me to step away from the game at this level,” Mata’utia said.
“I plan to play in the local competition and find a job, as my family and I move on to the next stage of our lives.
“I am comfortable with my decision and want to thank everyone at the Club, and also the fans, for all of the support.”