World Cup 2013: Sonny Bill Williams ready for World Cup final

New Zealand coach Stephen Kearney says Sonny Bill Williams is ready to justify his World Cup squad inclusion ahead of Sunday's final against Australia.

The second row, 28, was a controversial choice after originally telling selectors he had "other commitments".

"There is still one game to go and Sonny wants to make his biggest impact on Saturday," said Kearney.

Greg Eastwood has been called up to replace second rower Frank Pritchard, who has a hamstring strain.

Dual-code international Williams took the place of 21-year-old Tohu Harris in the squad after belatedly making himself available.

The Sydney Roosters star, who played in New Zealand's 20-18 semi-final win over England, was also named international player of the year on Wednesday - the first Kiwi to be awarded the accolade.

"I knew what to expect from Sonny," Kearney added. "I've known him for a long time and what he brings to the table from the performance point of view and away from the field too.

"I knew that he was going to turn up and perform. That was never an issue."

Williams started his career in league, but switched to union in 2008.

He returned to league at the turn of the year as a 2011 World Cup winner with the All Blacks - victory against Australia in the 13-man game on Saturday would make him the first player to win World Cups in both codes.

Australia-born Pritchard was the notable exclusion from Kearney's 19-man squad for the final.

"We made a final decision on Frank this morning," said Kearney. "He'd love to play, and we'd love to have him there, but the stakes are as high as they get this weekend and he's not 100%.

"It's naturally very tough for him to be this close and ruled out, but we're very happy with our cover."

The squad also includes three wingers, with Jason Nightingale joined by Manu Vatuvei and Roger Tuivasa-Sheck, who both had injury concerns this week.

The final, taking place at Old Trafford, is set to be best-attended international rugby league match of all time after it was announced as a sell-out.

New Zealand squad to face Australia: Jesse Bromwich, Greg Eastwood, Kieran Foran, Alex Glenn, Bryson Goodwin, Shaun Johnson, Sam Kasiano, Kevin Loche, Issac Luke, Simon Mannering, Ben Matulino, Jason Nightingale, Frank-Paul Nu'uausala, Elijah Taylor, Roger Tuivasa-Sheck, Manu Vatuvei, Jared Waerea-Hargreaves, Dean Whare, Sonny Bill Williams.

Australia squad to face New Zealand: Cameron Smith, Greg Bird, Darius Boyd, Daly Cherry-Evans, Cooper Cronk, Andrew Fifita, Jarryd Hayne, Paul Gallen, Greg Inglis, Brett Morris, Nate Myles, Josh Papalii, Corey Parker, Matthew Scott, Billy Slater, James Tamou, Brent Tate, Sam Thaiday and Johnathan Thurston.