Sonny Bill Williams has announced his intention to return to rugby union in 2015, just in time to force the 28 year old back into New Zealand's World Cup side.

Williams has recently turned down a three-year deal from New Zealand Rugby Union in favour of another year with the Sydney Roosters.

The Kiwi star returned to rugby league last season, leading the Roosters to NRL glory last month.

"I told the Roosters this is probably my last year," he told Fairfax Media.

"My intentions are to try to go back after next year and force my way into the All Blacks squad."

Williams will be aiming to make history with the Roosters, by leading them to a historic retention of the NRL crown.

The New South Wales club would become the first side since the Brisbane Bronco's managed the feat in 1993.

"A major factor in my desire to play next year was to try to go back to back, because it hasn't been done for so long," he added.

"I know it will be hard for me to force my way back into the New Zealand rugby [union] set-up, but [another season in NRL] was just something I felt was right and I just went with my heart in the end.

"I decided that I wanted to stay with the boys because it is tough leaving when you are a part of the start of a successful thing."

Williams snub to New Zealand Rugby Union may have come at a cost to the Kiwi's aspirations, with New Zealand general manager Neil Sorensen left disappointed by the news.

But All Backs coach Steve Hansen has given a lifeline to the centre, admitting it would be "very hard to leave out" the talented 28-year old from their world title defence in England in September 2015.

"He wants to play in the World Cup so that means he has to come back and play Super 15 in 2015 and he'll be like everyone else in that competition," Hansen told RadioLive.

"Everyone will be eligible to be selected for the All Blacks if they play well enough and, if he's in the form we know he can produce, he'll be very hard to leave out."

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