The Waratahs are sweating over the fitness of centre Kurtley Beale ahead of Saturday's Super Rugby semi-final against the Highlanders.
Both the Wallaby playmaker and winger Rob Horne sat out training on Tuesday as they struggle with quadriceps and calf injuries respectively.
Although Horne is expected to be fit in time for this weekend's showdown in Sydney, Beale is in a race against the clock.
Beale will be given until Thursday to prove his fitness with Matt Carraro set to step into the breach if need be.
"Time is against us," Waratahs assistant coach Daryl Gibson told the Sydney Morning Herald.
"[He has been] doing his exercises and getting up to a running pace that enables him to at least have a crack on Thursday to see if he can make it," added Gibson.
"At the time, it was a two- to three-week injury, and obviously time is against us. He's going to give it a go, and if he comes through that then he'll be available."