"There are a few guys that are established All Blacks that are starting to come into some good form and a lot of young guys starting to put there hands up," he said.
"When the time comes to pick the side we'll have plenty of candidates.
"Everyone is a chance, we'll say no to nobody."
Earlier this week, Rugby World Cup-winning coach Graham Henry revealed what he believed to be the All Blacks' biggest weakness ahead of this year's tournament in Japan.
Henry told Newstalk ZB's Jim Kayes Steve Hansen should be trying to find a world-class blindside flanker, with injuries and inconsistent form having stymied several candidates' claims on the No 6 jersey in the post-Jerome Kaino era.
"If you look at the All Blacks right now, they're obviously going to miss Damian but the only other position is probably six, where they haven't really found Jerome Kaino's replacement," Henry said.
"So they've been fiddling around with that position and I think they will sort that out before the Rugby World Cup - who is that person. But in every other position apart from the McKenzie injury, they're looking in pretty good shape."
The All Blacks face South Africa, Canada, Namibia and Italy in pool play in Japan, with the first match against the Boks on 21 September.