Inaugural Sydney FC coach Pierre Littbarski has revealed that he is definitely interested in the soon-to-be vacant Australian national team coaching job.

The German World Cup-winner says he would love to replace Pim Verbeek as Socceroos coach when the Dutchman vacates the role following the World Cup.

"I'm absolutely interested in the Socceroos job," he said.

"Because I know the coach (Verbeek) is finishing, it's very enticing for me, but it depends what the federation (Football Federation Australia) thinks."

Littbarski also said that he expects the Australian team to worry his native Germans in their World Cup opener on Sunday (Monday morning AEST).

"Physically they can cope with the Germans, so that will be for us the most difficult game in the first round, when you're not yet in a rhythm," he added. "It will be a very good test of German strength.

"If you play high-speed football and pressure a team, Ghana and Serbia will fall apart, but Australia won't."