The 18-year-old back rower has penned a three-year full-time contract with the Giants after impressing while on trial with the club.
“It’s a super signing for us and one that shows how highly we are now regarded in the game by top line players,” said managing director Richard Thewlis.
“Young Matthew had a superb international series and has trained with the first grade here since then with a view to staying on when he had other offers on the table to start immediately.”
“I could have signed earlier at other clubs but the Giants are where I wanted to be and I am delighted to have got this deal,” he said.
“The step up to full time will be hard but it’s a challenge I am looking forward to and to my debut at Batley at the weekend.
“We have got a lot of younger players all pushing for first team places in these friendly games and all of them look to have the benefit of full time training which makes such a difference.”