Serious doubt has been cast over the March running go the AGP, with Australia's strict border controls likely to be an insurmountable road block in the short term.
Work had been done on a biosphere concept, which would have seen Formula 1 teams and drivers operate in a tightly-controlled bubble, however it appears avoiding a two-week quarantine to enter the country won't be possible.
Should the expected postponement go ahead it won't just require the Formula 1 schedule to be reshuffled. Supercars was set to host its second round of the 2021 season at Albert Park.
There has long been a back-up in place, though, with Supercars understood to have booked Sandown for the March 18-21 slot as part of its 2021 calendar planning last year.
While that wasn't formally confirmed at the time, Sandown was listed as a "flex option" as part of the Supercars calendar announcement.
A spokesperson told Motorsport.com last night that no statement would be made until there was official news on the AGP's fate, however the category's position has since been updated to include confirmation that Sandown is locked and loaded if required.
“If any changes prevent the AGP from going ahead, we’re ready to go racing at Sandown Raceway over the same weekend," read a short statement from Supercars.
Sandown hasn't hosted Supercars since November in 2019, the circuit having missed out last season thanks to the second wave of COVID-19 cases that left Melbourne locked down from July until into October.