Sonny Bill Williams is set to provide a huge boost to New Zealand's World Cup defence - and the tournament itself -*after making himself available for the Kiwis.
Williams was not in the 24 man squad named by New Zealand coach Stephen Kearney earlier today after saying he had other commitments.
But*the Sydney Roosters and All Blacks superstar*has since had a change of heart and advised Kearney he wanted to help the Kiwis win back to back World Cups.