The "Phoenix Four", who own MG Rover's parent, Phoenix Venture Holdings, have pledged £49m ($92.6m) in assets to help keep the troubled firm going.
Rover's administrators, PricewaterhouseCoopers (PwC), said they had a letter committing the £49m.
However, PwC said there were a number of legal hurdles that would have to be overcome before the "Phoenix Four" could make the assets available.
The assets could be used as collateral to help secure loans for Rover.
Troubled times
Rover went into administration on Friday.
PwC are now looking for a buyer for Rover and hoping to reopen talks with Shanghai Automotive Industries Corporation of China.
Last week, SAIC pulled back from investing large sums in the Birmingham-based car company, but PwC says its circumstances have changed since going into administration.
The UK government has said it will loan MG Rover £6.5m to keep it as a going concern and pay staff wages for a week.
But administrators and the unions said it could take three weeks to do a deal, meaning at least £13m more would be required.
The assets of the four could help to raise loans to keep Rover afloat while a deal is negotiated.
Phoenix Four
Monday's move by the four Phoenix directors, led by John Towers, former chairman of MG Rover, appears designed to counter criticism that they have benefited at the car maker's expense.
The four have made about £40m from Rover, in a combination of pay and benefits.
The view from Longbridge
Most of the assets they have pledged are thought to belong to Phoenix Venture Holdings, in which the four are the main shareholders.
But it is not yet clear whether PwC will be able to accept their offer because of legal considerations.
"There are a number of challenges involved in getting to a position where the Phoenix Four can finally commit to do that," said Jon Bunn, a spokesman for PwC on Monday night.
Castle as collateral
The Financial Times said the £49m in assets pledged by the Phoenix Four included Studley Castle in Warwickshire, £1m in cash and £25m in "collateralised cash".
However, there was no guarantee that even with extra loan finance, Rover would be bought by another company.
"We are realistic in our expectations here," PwC partner Tony Lomas told a press conference. "It is a really complex deal to put together and it will take some time."
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MG Rover and its engine making company Powertrain have been making estimated losses of between £20m and £25m per month.
Several parties have expressed interest in Rover in the past few days, PwC said, but none had yet made a firm financial offer.
These include Alchemy Partners, the private equity firm headed by Jon Moulton which tried but failed to buy MG Rover in 2000.
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