Giants head coach Simon Woolford said he was looking to add strength to his team’s front row.
“I was looking for some real grunt and aggression in the front row and Suaia will bring that and a whole heap more,” Woolford told Sky Sports.
“The fans will love his action-packed style and he is a man that won’t take a backward step and he relishes the tough stuff up front.”
Matagi was excited to take his skill set to the English league.
“I am extremely excited to take my football to the next level under the leadership of coach Simon Woolford and I’m also looking forward to the challenge of playing in the English Super League,” he told Sky Sports.
“Joining a proud club like the Huddersfield Giants is a privilege and I will represent our fans to the best of my ability.”