The new man at the helm of the two-time A-League champions says somehow, in some way, his men can still improve on last weekend's 5-0 demolition of Melbourne Victory.

That can only be worrying news for Wellington Phoenix, who will play host to a Roar machine firing on all cylinders at Westpac Stadium on Sunday.

Vidosic said he was 'not happy' with the way his team defended against Victory, despite holding them at bay for 90 minutes.

"We can definitely improve on our defending. Goals win you games, but clean sheets win you titles," he said.

"Although generally, our defence has played much better this season than what we did last year, we are aiming to improve even more.

"We're looking to improve every game. That has been the way we've operated for the last several years and we're not going to change that."

Brisbane's new-look rearguard has barely put a foot wrong this season.

The only goal that has slipped past them was a late, sucker-punch header from Perth's Billy Mehmet in the opening round.

But this is the high-intensity, high-pressure nature of the Roar's culture of excellence, which has fuelled them to two seasons of A-League dominance.

The likes of young central defender Matt Jurman and stand-in right-back Jack Hingert will need to be at their best against a Phoenix side with a few new tricks up their sleeve.

Gone are the days that shutting down Paul Ifill was the key to victory over Wellington.

After the off-season recruitment of hulking Belgian striker Stein Huysegems, ex-Newcastle marksman Jeremy Brockie and Solomon Islands international Benjamin Totori, the Phoenix now have several options in the final third.

"From what I’ve seen, they’ve got a very different frontline," Brisbane captain Matt Smith said.

"Anyone of those can hurt you. They can get goals from anywhere. They like a few crosses into the box and have a few big boys that can come up for set-pieces."