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Dual international Sonny Bill Williams has confirmed a one-season deal with the Sydney Roosters for 2013 but admits coming back to the NRL wouldn't have been his first choice.
Rugby League's worst-kept secret finally became official on Tuesday, with Williams admitting he only left rugby union because of a handshake agreement he made with Roosters Chairman Nick Politis three years ago.
Williams said the decision was "tough" but he would be looking at the season with a "glass half full" attitude.
The 27-year-old said he'd grown to love rugby union after winning the Super Rugby championship this year with the Chiefs and the Rugby World Cup with the All Blacks in 2011.
Williams said returning to league after a five-year absence would be a "huge challenge."
His contract has yet to be ratified by the NRL but the Roosters expected that to be just a formality.
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