Business Secretary Sajid Javid said that he did not think nationalisation was the solution but did not rule it out.
"It wouldn't be prudent to rule anything out at this stage, but I think that nationalisation is rarely an answer in these situations," Javid told the BBC television.
He said that any buyer would want to look at "plant, pensions and power supply", which ministers were "working on".
Javid said he thought there was time to find a buyer for the Port Talbot plant and Tata Steel's other UK assets.
"Tata will issue an offer document very soon," he told BBC television.
Indian-origin steel tycoon Sanjeev Gupta, president of Metal processing company Liberty House, is understood to have been in touch with the government over a potential purchase.
"If the company, its people, its workers and the government would be willing to consider my suggestions, then I'm willing to engage in a discussion about what role we will play in that," Gupta was quoted as saying by The Sunday Telegraph newspaper.
Gupta wanted to discuss possible government help to replace Port Talbot's traditional blast furnaces with modern electric arc furnaces and energy costs.
Extra relief from carbon tax was another important issue.
