The big second-rower broke down during a routine drill in Brisbane today and left the field immediately for treatment as concerned medical staff came to his aid.
Dean Mumm will step into the breach should Sharpe be ruled out of Saturday night's encounter at Suncorp Stadium, while Reds and Australia A flanker Hugh McMeniman has been drafted in as cover.
The Wallabies are looking to make it three straight wins under Robbie Deans after beating the French 34-13 in the first Test in Sydney.
