Fresh from the signalled end of his All Blacks career, Sonny Bill Williams will join the Toronto Wolfpack rugby league club under a deal worth a reported $10 million, Australian media are reporting.

Wide World of Sports reporter Danny Weidler reported Williams had signed a two-year deal with the Canadian club, making him the highest-paid rugby league player in the world.

"The deal is stunning," Weidler told a Nine news bulletin. "It's probably the biggest deal I have ever heard in rugby league and rugby."

Toronto Wolfpack are newcomers to the English Super League, having won promotion, and have been keen to secure Williams to lead their attack.

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​Williams, 34, completed his All Blacks career on Friday when he was part of the side that beat Wales to take third place in the Rugby World Cup finals.

HANNAH PETERS/GETTY IMAGES Sonny Bill Williams, right, and fellow retiring All Blacks, from left, Ben Smith, Ryan Crotty, Kieran Read and Matt Todd show their bronze medals after beating Wales in a Rugby World Cup playoff for third placing on Friday.

He returned home with the team on Tuesday morning.

Last month, Toronto Wolfpack head coach Brian McDermott revealed Williams has expressed an interest in joining the Super League newcomers.

The Canadian outfit are on the lookout for big-name signings following their promotion from the second-tier Championship. It was clear then they intended to follow up on their approach once his Rugby World Cup commitments were over.

McDermott said Toronto wanted to bring in a David Beckham- type player to do for the Wolfpack what the former Manchester United favourite did for LA Galaxy and that Williams fitted the bill.

Earlier this year, Wolfpack owner David Argyle said there were "10 superstar names" on a wish list to bolster the squad for the step up to Super League and Williams was his top target.

Argyle subsequently sacked himself as club chairman and chief executive of the Wolfpack after admitting he had "disgraced" himself with a racist slur to a visiting English player.

Williams was part of All Blacks' World Cup-winning squads in 2011 and 2015. His game against Wales, in which he set up long-time team-mate Ryan Crotty with a try with one of his famous offloads, was his 57th appearance in test rugby.