The Holden Racing Team is assessing and repairing the damaged #2 Commodore with focus on Sunday's 1000km race at Bathurst.
Team boss Adrian Burgess said the damage was extensive, after the car went hard into a tyre barrier and rolled over at turn two at Mount Panorama in practice, also tagging the right rear tyre of Craig Lowndes' Red Bull Holden in the process.
"Warren Luff is fine, which is the main thing," Burgess said.
"We've only had a quick look, but the damage is extensive.
"We need to pull the sides off the Commodore and assess what the true extent of the damage is.
"The cage has been damaged in a couple of places, and we're sure that we can fix the place we've identified so far.
"However, there's other damage yet to be assessed that we're not sure about yet, and whether we'll be able to fix it to the high standards we expect.
"We'll have a better idea of whether it will be ready in an hour or so.
"For now, we've got to focus on getting the HRT Commodore fixed, and ready for tomorrow's Great Race ... the accident proves how strong these new generation Holden V8 Supercars are. Unfortunately, the car just lost the front brakes going into Turn 2."
It was unfortunate Lowndes - who drove onto the podium with Luff at Bathurst last year - was involved, and Burgess could only say sorry to his former team.
"We can only apologise to Red Bull Racing Australia - it was not their fault. They just happened to be in the wrong place at the wrong time."
Stay tuned to v8supercars.com.au for updates on both cars from the Supercheap Auto Bathurst 1000 this weekend.