"While the team's work is not complete, I have accepted the chief of defense force's request to begin specific training for a possible building partner capacity role in Iraq," he said.

"This does not pre-empt any cabinet decisions, but is prudent given defense officials are close to providing final advice on a possible mission."

Contingency training would include force protection, cultural awareness and skills relevant to a possible deployment.

"Should there be a deployment, our first objective must be to keep our Defense Force personnel as safe as possible," Brownlee said.

Earlier Tuesday, Prime Minister John Key said the New Zealand government was still considering the country's response to the fight against IS.

"This brutal group is a threat, not only to stability in the Middle East, but regionally and locally too," Key said in a statement on the government's program for this year tabled at the opening of parliament.

The government's response to IS will cover areas such as humanitarian assistance, diplomatic efforts, intelligence and capacity building, he said, noting a decision will be made in the coming weeks about a potential military training contribution.

Last week, visiting British Foreign Secretary Philip Hammond asked New Zealand to join an international coalition to fight IS insurgents as "part of the family" with the United States and Australia.

Key has repeatedly insisted New Zealand troops would not see combat.