Bradford Bulls three-quarter Patrick Ah Van will join Widnes Vikings on a two-year deal at the end of the season.
The 23-year-old joined the Bulls last year from New Zealand Warriors, who ended his deal early to help the move.
The Samoa international has made 22 Super League appearances this season, scoring eight tries and 74 goals.
"Pat will add a tremendous amount of power and size to our back line. He's a proven try scorer," said Widnes coach Denis Betts.
Bulls football manager Stuart Duffy said: "We'd like to thank Patrick for his services to the club and we wish him every success in the future."