Warrington forward George King has signed a two-year contract with Wakefield.
The 23-year-old announced after the Wolves' defeat at Wembley in August that he would be making the move to the Yorkshire club at the end of the season and Trinity have now made it official.
He will join up with the squad when they return for pre-season in November after four years at Warrington.
Wakefield coach Chris Chester said: "George will add some real toughness to what already is a big pack.
"He will bring plenty of energy to the group and I am really pleased that he has chosen to sign for Wakefield for the next couple of seasons.
"I look forward to working with him and seeing what he can bring to the side."
King, who is in Ireland's squad for the European Championship, made the last of his 97 appearances for Warrington in last Saturday's Grand-Final defeat by Wigan.
"I am really excited," said King, whose younger brother Toby plays for Warrington. "Chris Chester came to speak to me during the season and sold me the vision for the club and the direction of where Wakefield is going.
"I am really looking forward to it and being able to meet the rest of the lads in pre-season."
King is Wakefield's first signing for 2019, although they are also thought to have agreed a deal for Leigh stand-off Ben Reynolds.