Danny Weidler reported on Nine News Williams had accepted the jaw-dropping, two-year deal with English Super League side the Toronto Wolfpack.
The Wolfpack will be heading into their first ever Super League season in 2020, and doing so with a multiple time Rugby World Cup victor and multiple NRL premiership victor. Three early-season games will be at neutral sites in England including the opener on February 2 at Headingley Stadium in Leeds against the Castleford Tigers which will be part of a doubleheader with a Leeds Rhinos match.
Williams will become one of two permitted marquee players, which means that only the first 150,000 pounds ($A298,000) of his huge salary will count on the cap.
SBW has not played Rugby League since 2014 when he left the Sydney Roosters after just two seasons to link up with the All Blacks ahead of the 2015 World Cup in England.
England lost the World Cup final 32-12 to South Africa last Saturday but Tuilagi was one of the best players when they crushed the All Blacks in their 19-7 semifinal win.
His league experience also saw him compete internationally for New Zealand.
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He moved to rugby union in 2010 and had spells with French side Toulon and New Zealand Super Rugby sides the Crusaders, Chiefs and Blues.
Williams also held World Boxing Association International heavyweight title and New Zealand Professional Boxing Association heavyweight title before it was stripped off after he failed to respond to challenges.
For North American sport, it's probably the rugby equivalent of David Beckham's 2007 signing with the Los Angeles Galaxy of Major League Soccer.
Signing a player who is arguably the best known in either code will now lift the Wolfpack's profile immeasurably throughout Canada.
The Den will open on April 18 for the Toronto Wolfpack's first home game in Super League.
"It's not carefree abandoning of all the principles we've put in place in Super League, but if we're genuine in our aspirations to bring stars and have events, to make the game as vibrant as it was [when Super League started] in 1996 - or 1895 when northern union first broke away - then we are at the moment in the game where we need to make the pivotal decisions".
After spending millions over the three years it's taken to get the club promoted through the lower tiers of rugby league, this is an explosive statement of intent that they intend to make their mark on Super League now they have reached the top flight.