MG Rover's administrators last night said they would consider offers for the collapsed carmaker past yesterday's deadline in a bid to find a buyer for the company.
PricewaterhouseCoopers said the cut-off was not a "drop dead day" which would automatically lead to the break up of the business.
But PwC insisted it needed to hear from potential buyers soon before it considered what to do with the remains of the Longbridge company.
It is estimated to be costing #1.5 million a week to maintain the site, which still employs around 500 people.
If no offers at all are forthcoming, PwC could eventually consider selling off parts of the business piecemeal.
Rob Hunt, partner at PwC and joint administrator at MG Rover, said: "There have been a lot of reports saying Friday was the drop dead day for MG Rover.
"It is not a drop dead day. We would be foolish to rule out any offers that came in over the weekend or early next week.
"But we do need to hear from interested parties soon. We want to know what their funding arrangements are and what their plans are so we can make a decision where we go next.
"We cannot allow this situation to go on indefinitely."
No firm offers had been received last night, the administrators said.
Mr Hunt said: "We have written to people, and asked them to demonstrate they have the necessary funding for the business and respond to us by Friday, May 13.
"We have said we can provide no assurance the process will remain open after this day. We want to get on with distilling the interest down."
There has been reported interest in MG Rover from various companies, including from Iran and Russia.
However, no firm proposals have so far been submitted by Iranian car maker Dastaan or the millionaire owner of sports car maker TVR, Nikolai Smolenski.
Meanwhile former executives of MG Rover, including the former managing director of the Powertrain engine making factory, are also thought to be in the running.
A group, led by Fraser Welford-Winton, is thought to want to revive the Austin Healey brand as part of a management buy-out backed by US private equity investors.
* The Task Force set up to help redundant MG Rover workers has already helped 100 people to begin new jobs.
Nick Paul, the chairman of the MG Rover Task Force and the regional development agency, Advantage West Midlands, stressed that there was still a "long way to go" in helping thousands of other jobseekers.