Sam Stosur says injury-hit German star Andrea Petkovic is still a top player and Australia will need to be wary of her talent in their Fed Cup semi-final.

Samantha Stosur has singled out Germany’s Andrea Petkovic as a serious threat to Australia’s hopes of winning the Fed Cup for the first time in 40 years.

Petkovic is part of the five-strong German team preparing to take on Australia in this weekend’s semi-final in Brisbane and Stosur believes she’s as dangerous as anybody in the opposition lineup.

World No.7 Angelique Kerber may be Germany’s top-ranked player but Petkovic is on the road back to the top 10 after an injury-blighted past couple of seasons.

Petkovic, 26, heads to Brisbane after victory in the WTA event in Charleston earlier this month and has good memories of Pat Rafter Arena after reaching the final of the Brisbane International in 2011.

Stosur says the former world No.9 is a far better player than her current ranking of 28 would suggest.

“She just won the Charleston event so she must be in good form,” Stosur said.

“Even though her ranking isn’t where it once was, it certainly doesn’t mean she’s a lesser player at the moment.”

Stosur will team up with Casey Dellacqua, Ash Barty and Storm Sanders for the tie, with Queenslander Stosur excited about competing in front of a home crowd.

Australia hasn’t won the Fed Cup since Evonne Goolagong led the team to victory in 1974.

Stosur says the opportunity to try and create a bit of history was exciting.

“It’s great to be in this position and be in a semi for the first time in a very long time,” she said.

“I didn’t play here in January so it’s nice to be able to play in my home state and play.

“It’s a pretty unique prospect to be in the semis and playing here in Australia.”