The privatisation agency extended until March 28 the deadline for submitting binding offers for the freight unit of the country's railways holding company BDZ, the agency said.
The deadline is extended in response to candidate buyers' request for extra time to perform due diligence studies at the company, the agency said in a statement.
The deadline for inspection of the company's assets and meetings with the management is also extended, until March 22.
Last month the privatisation agency admitted four candidates - Romania's Grup Feroviar Roman, Sofia-based Bulgarian Cargo Express and Balkan Financial Services, and Austria's Donau-Finanz Transport und Beteiligung - to the next stage in the tender for 100% of BDZ's freight unit.
The government aims to get at least 200 million levs ($133.9 million/102.3 million euro) from the sale of the freight unit of BDZ, transport minister Ivailo Moskovski said in January.