Matt King is to return to Australia to play for South Sydney, whose trawl of Super League has now netted them three Burgess brothers.
The 30-year-old King, a former Kangaroo winger, is to leave Warrington after four years rather than take up an extra year's option.
"Matt has had his time in England and he wants to come home," said Souths' chief executive, Shane Richardson, of his New South Wales-born capture.
After a slow start here King has been a major success with the Wolves, playing in two Challenge Cup final victories. But he and his wife had their first child this month, which has influenced their decision.
Going to the ambitious Souths will enable him to renew his old partnership from his time at Melbourne with Greg Inglis, who was Souths' big signing for this season.
He will play the rest of this Super League season but is a doubt for Warrington's next game, at Castleford on Friday, having hurt his hip scoring a typically spectacular try against St Helens last weekend.
Meanwhile, the oldest of the Burgess brothers is to make his NRL debut for Souths on Sunday. Luke Burgess only gained a release from Leeds earlier this month, but he has been named in the squad to face Cronulla because of a shortage of forwards. Sam and Tom Burgess are already playing for Souths although the England forward, Sam, has a long-term ankle injury.
Castleford are likely to be without Kirk Dixon and Jordan Thompson for Friday night's game against the Super League leaders after picking up injuries in Perpignan last weekend.