Ghana face major injury concerns ahead of Saturday's clash against Australia in Rustenburg, but coach Milovan Rajevac remains confident his side can snatch the victory that would put them in command of Group D.

The Black Stars will be without defender Isaac Vorsah, while his first-choice centre-back partner John Mensah is also struggling. It means that Rajevac may have to field a completely different pairing in central defence, an area that was so key in helping them keep a clean sheet during their 1-0 win against Serbia in their opening game.

But Rajevac is optimistic his team can cope with the Socceroos, who must win or face the possibility of an early exit. He said: "Vorsah has not been training over the past seven days, we will see tomorrow, but I don't think he will be able to play. We will see how the situation is with Mensah, but we have other players who can replace them you know. We have enough players to come in and replace them."

The west Africans will head into the game as favourites following that opening win against Rajevac's fellow countrymen, a victory that is the only one by a nation from the home continent so far in the tournament. But the Ghanaian boss says he has been warning his players all week about complacency.

By making statements we will not win, it's only by the way we perform on the pitch.

Milovan Rajevac, Ghana coach

He continued: "Over the past few days we have been preparing for that. We didn't want players to be overly confident. They have to be well concentrated. You know everything happens on the pitch. By making statements we will not win, it's only by the way we perform on the pitch. Also, you have seen how the results have gone in this World Cup, so there are no favourites. It's all about playing well and getting the result - that's the most important thing."

Germany's 1-0 defeat to Serbia has thrown the group wide open and Rajevac knows that only victory will do for his team. He said: "The game between Germany and Serbia shows that at the World Cup there is no easy game and the situation becomes more complicated for all of us in this group. We did win against Serbia, but it's now that the real job awaits us. We have two more games to play and Serbia now has the opportunity to get to the round of 16."

Asked whether he had any specific plans for Pim Verbeek's side, he added: "Each game at the World Cup is a game in itself and before the game starts we cannot know what will be the final result. We will see how the game starts, it all depends. For sure they have their own motives, their way of playing, but so do we. Tomorrow we will see who will manage to be dominant on the pitch."