Comet's administrators have confirmed a further 125 stores will close by the end of the year if they fail to get a firm offer for the whole business.
Around 70 stores of the original 236 will remain open until the electricals retailer's remaining stock is sold, Deloitte added.
Some 5,000 jobs remain in the balance at the embattled retailer, which called in the administrators earlier this month.
Deloitte's Chris Farrington said a "small number of interested parties" remained and he hoped a positive outcome could still be achieved.
"Should any acceptable offers be received for stores we will delay the closure process," he said.
"Unfortunately, in the absence of a firm offer for the whole of the business, it has become necessary to begin making plans in case a sale is not concluded."
Stores will begin closing in December, he added.
Since Deloitte was appointed to work for the electricals chain, some 1,500 jobs have already been axed.
Last week, the entrepreneur behind Appliances Online confirmed he had tabled a bid for Comet's web-based operations - but not for the whole business.
John Roberts said he had put in a "seven-figure offer" for Comet's website, although the deal would see the business disappear from the UK's high streets.
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