Venues NSW,which runs the SCG,confirmed on Monday it would reduce capacity at the ground to 25 per cent for the first day of the Test on Thursday but stressed the situation remained"fluid".
Chief executive Kerrie Mather said the numbers could be increased during the Test.
"I think the capacity of 25 per cent is where we're starting,"she said.
"Our plan is scalable,so if there was the opportunity in what is a very fluid environment and an improving situation to host more,we could certainly host more."
Ms Mather said all fans would be expected to wear masks,which are compulsory in many indoor settings in Greater Sydney,but residents from some areas,including dozens of COVID-19 case locations around Berala and the upper part of the northern beaches,are banned.
"Patrons who reside in certain at-risk areas,as identified by NSW Health,are not able to attend,"Ms Mather said.