Durban remains the only city with a confirmed bid after Edmonton in Canada withdrew in February.
While South Africa said details from ongoing talks could not be revealed, the CGF insisted that Nov. 30 was merely a deadline and not a day for announcements.
"The South African government is still fully committed on hosting the Games," Esethu Hasane, spokesperson for the Department of Sport and Recreation, was quoted as saying by China's Xinhua News Agency.
"Unfortunately, now the Department is not in a position to be making any pronouncements on ongoing talks."
If Durban goes on to host the event, the Commonwealth Games will travel to Africa for the first time in its history.
The 2018 Games will be held at Gold Coast, Australia.
(Reporting by Debanjan Bose in Bengaluru)
