"Fuel loads right across Victoria are now dry and ready to burn. The extreme temperatures over the coming 3 days will test fire services and the community," Mr Ferguson said.
"It's critical we minimise the risk of any fires before Friday."
Mr Ferguson said a number of serious fires had threatened communities at Kangaroo Ground, Little River and Sunbury today, Tuesday 14 January.
He urged Victorians to remain vigilant, check fire danger ratings and stay informed by listening to emergency radio broadcasters, monitoring emergency.vic.gov.au, downloading the FireReady app,r calling the Victorian Bushfire Information Line on 1800 240 667 and monitoring CFA's Twitter and Facebook accounts.
During a TFB, subject to exceptions, no fire can be lit in the open air or be allowed to remain alight in the open air between 00:01 and 23:59.
Visit www.cfa.vic.gov.au/warnings-restrictions/can/ to find out what you can and can't do on a day of Total Fire Ban.