African flag-bearers Ghana are facing an injury crisis ahead of Saturday's World Cup meeting with Australia with both their first-choice centrebacks doubtful for the Group D match. Ghana coach Milovan Rajevac revealed that Isaac Vorsah had not trained for 'several days' while captain John Mensah, who has suffered from recurring back- related injuries all season, broke down in training at the Royal Bafekong stadium on the eve of the match. 'We will see tomorrow, I can't tell you anything more right now,' Rajevac said. 'We'll see tomorrow if they are able to play or not. We will decide before the game starts.' Ghana are the only African side to have won a match so far in the tournament, having beaten Serbia 1-0 in their opener. 