Aaron Finch will not rush to any rash decisions following Australia's humbling 89-run defeat to New Zealand in their T20 World Cup opener on Saturday.

Australia were looking to make a positive start to their title defence at the SCG but found themselves on the end of an embarrassing loss.

It was a measure of revenge for the Black Caps, who lost to Australia in last year's final, with Devon Conway playing a vital role as his 92 not out off 58 helped New Zealand to a total of 200-3.

The swift dismissals of David Warner, Finch himself and Mitchell Marsh left Australia's chase doomed at 34-3 by the fifth over – Tim Southee eliminated two of them as he finished with remarkable figures of 3-6.

Australia were eventually bowled out for just 111, but captain Finch did not feel it was necessary to lay into his team, convinced they have a group of players and structure to retain their title.

"We still feel as though we've got the right structure of team, and we've got the right players to win the World Cup," he said.

"Obviously, it's taken a big hit today with the net run rate, and when that happens, you need to play well, and we need to we need to get better, quickly.

"And then, like I said, you need a bit of luck in T20 cricket as well, in such a brutal tournament.

"So, I think we've still got the right structure of the team. There's no doubt about that.

"Whether you go with an extra spinner, an extra quick, something like that, I think that's the only real decision to be made.

"Well, I'm still confident in the 15 that we've got, no doubt."

Finch will hope for a response against Sri Lanka at Perth Stadium on Tuesday.