OEHRINGEN, Germany - Australia's players aren't taking much notice of Ronaldo's early World Cup reviews.

The Brazil striker has been criticized for being overweight and unproductive, while a bout of dizziness also prompted a visit to a hospital.

But the Socceroos, who face Brazil on Sunday in Munich, are still wary of the two-time World Player of the Year.

"For years now, he's been one of the most popular names in football," defender Lucas Neill said Thursday. "Him and his buddy with the 'inho' on the end of it (Ronaldinho). You can't give them a second's peace.

"I'm not going to comment on his performance. It's obviously not the Ronaldo we're all used to seeing. We're used to seeing him banging in goals left, right and center. It's up to us to make sure he has another quiet game."

Midfielder Jason Culina, meanwhile, thinks Ronaldo will have something to prove Sunday.

"He's always dangerous," Culina said. "All the (Brazil) players on their day, they can do anything. Ronaldo's no different. We're going to give him the respect he deserves, but not too much."

Brazil defeated Croatia 1-0 in its opening Group F game Tuesday in Berlin, with Kaka scoring.

"Maybe they got their cobwebs out in that first game, so it can go either way," defender Tony Popovic said.

Defender Craig Moore said that, against Brazil, "you can't really afford to single one player out. Because you give one player too much attention, they've got a very gifted side and somebody else can cause you damage."

Moore said Brazil had "done enough" in the Croatia game to get the win.

"Probably not the best they've ever played, but they got three points," Moore said. "You can't afford to switch off, because at this level you will be punished. More so with the likes of your Brazil and what have you. They do have special players."

So how do you stop an attack that features Ronaldo, Ronaldinho, Adriano, Kaka and Robinho?

"Kick them," Culina said with a laugh.