However, they will still need to make a final call on the venue for the third Test in coming days and their hand may be forced if Queensland follows Victoria and South Australia by shutting its border to Greater Sydney.
According to CA, the leading option was still to play the match from January 7 to 11 in Sydney but if not, swapping the third and fourth Tests between Sydney and Brisbane was the top alternative.
That would leave the SCG Test being the fourth of the series, played from January 15-19.
The reason that option has been identified as the best back-up plan is to allow for the Australian and Indian teams, and television broadcast crews, to cross borders more easily. If the growing cluster in Sydney prompted the Queensland government to close its border to people from the city, it could make it impossible to travel north from Sydney to Brisbane for the fourth Test.
Hosting the next two Tests in Melbourne, where the series will resume on Boxing Day after Australia took a 1-0 lead in Adelaide, is another option and the appeal of that for administrators and broadcasters it would require less movement.
The SCG Trust was on Sunday still operating as if the third Test was still going ahead as scheduled from January, sending out corporate hospitality invitations to guests.
But officials from the ground and the sport, whose ambitions for a capacity crowd at the SCG have gone out the window, are watching closely to see if the virus cluster spreads further.
NSW Premier Gladys Berejiklian announced increased restrictions on Sunday as she revealed 30 new cases of community transmission, 28 of them linked to the Avalon outbreak and the other two from the northern beaches as well.
Chris Barrett is Chief Sports Reporter of The Sydney Morning Herald.