Sonny Bill Williams makes his return to Eden Park, this time for the Roosters against the Warriors.

Sonny Bill Williams during the captain's run at Eden Park before the All Blacks played the Wallabies the day after Red Nose Day.

With best mate Sonny Bill Williams and one of the trophies in our cabinet, 2012.

Williams tries on suits ahead of the press conference.

Williams announces his return to the NRL with a one year deal with the Sydney Roosters.

Sonny Bill Williams trains with the Roosters during the 2013 NRL season.

Sonny Bill Williams reacts after the Roosters win in the NRL grand final.

Sonny Bill Williams has defended his change of heart regarding his selection for the Kiwis on social networking site Twitter.

Earlier today Kiwis coach Stephen Kearney confirmed the Roosters superstar had made himself available for the upcoming rugby league World Cup.

That came less than a day after the squad was named, which didn't feature Williams "due to other commitments"

Getty Images STAR POWER: Sonny Bill Williams has it in spades.

That provoked anger from former Kiwis' team manager Tony Kemp, who said it would damage the credibility of the game.

"Someone needs to be held accountable for this monumental stuff-up," he said.

"No-one should ever be bigger than the game and here is another credibility issue for rugby league purely based on the egos of a select few."

But Williams said that change of heart came about after considering how much he wanted to represent his country:

"After a few tough seasons topped with an amazing one with the boys at the Roosters, I was then faced with the opportunity to have a long awaited break and go on holiday with my family.

"Without thinking the whole situation through thoroughly, I eagerly jumped at the chance to chill out and rest.

"After having some time to really think about how much representing my country means to me, I decided to then put my name forward for selection.

"Now I know the squad's already picked and I understand if I can't be a part of it, but I'm here and ready to help the brothers if they want me."

Kearney has already confirmed his interest in selecting the former All Black in the squad.

"Our thinking had always been that if Sonny was available, he would be part of the team. We are now exploring options around Sonny's possible inclusion in the tournament. This would require ratification by the World Cup organisers."

With the maximum number of players in a World Cup squad capped at 24, if Kearney chooses to include Williams, he will be forced to drop one of the players named yesterday.

The change of heart has provided renewed hope that he will return to the Roosters next year.

Williams's decision is a massive boost for the Kiwis and World Cup organisers, but more significantly for the Roosters as it suggests he has not yet committed to a return to rugby union.