Sydney-born Susak returns after two successful seasons playing in the German third division with SpVgg Unterhaching.

The defender joins Brisbane with a strong European football education having also spent five years playing in the Serbian leagues.

A former Adelaide United player, Susak has also tasted action in the A-League and the Asian Champions League.

Able to play anywhere across the backline, Susak's signing provides even more defensive options for Postecoglou.

"Susak give us some great options and if you look at the season, there are lot more games and we're going to need a strong squad," Postecoglou said.

"I think he'll be fighting for a first XI spot but also giving us a lot of depth in the right areas. I think he's the kind of guy who has a real desire to succeed and who'll do well in the Hyundai A-League."

And with just under two months until the opening Hyundai A-League match against Gold Coast United, Susak's name won't  be the last signature added to the squad's 2010/11 roster.

With an eye on the overseas transfer market, Postecoglou is determined to add another striker to the squad's attack.

"We have one visa spot left and that's where we are concentrating," Postecoglou said. "We have a few options but I'm not going to rush into that one, I want to get it right.

"We need depth all over the park ... with such a condensed calendar and injuries and fatigue, I want us to have a strong squad."