Former Wigan, Bradford and Harlequins winger Karl Pryce, 26, has joined Championship club Dewsbury.
The 6ft 7in threequarter, the younger brother of the former Bulls and St Helens stand-off Leon Pryce, now plying his trade with Catalan Dragons, was a free agent after being released by the Bulls at the end of last season.
"Naturally we are delighted to have been able to bring in a player of Karl's undoubted quality," said Dewsbury coach Glenn Morrison.
"I said all along that we had space for one more signing, and I've been looking for an outside back for a while, and Karl certainly fits the bill.
"He's started training with us and he's already made a big impact with the rest of the lads. I'm confident he'll settle in to what we want to do.
"It's a real boost for us ahead of the season and I hope the fans will get behind Karl and the rest of the players."
The Rams have also confirmed the loan addition of Wakefield Trinity Wildcats forward Chris Annakin.