"I believe it is necessary to have recourse to the financing mechanisms which is available within the European context," Teixeira dos Santos said in is written replies to questions submitted by business daily Jornal de Negocios.
"The country has been pushed, in an irresponsible manner, into a difficult situation on the financial markets," the minister said, referring to the fall of the government last month when parliament rejected its austerity programme.
"Faced with this difficult situation, which could have been avoided, I believe it is necessary to have recourse to the financing mechanisms available within Europe, adapted to the current political situation," he said.
"Such an approach would also require the involvement of the main political groups and political institutions," he added in comments posted on the newspaper's website.
There has been mounting speculation that Portugal will need outside help to resolve its debt problems as the markets pile the pressure on, demanding ever higher rates of return to invest in new government debt instruments.
Earlier Wednesday, Portugal had to pay sky-high interest rates on its latest bond sale while insisting it would meet upcoming debt repayments and that it was not in talks on securing a bridging loan to tide it over to June 5 polls.
The treasury raised 1.005 billion euros ($1.437 billion) at the sale but the average yield, or rate of return earned by investors, jumped to 5.902 percent on the 12-month bills from 4.331 percent at the last such auction on March 16.
For the six-month paper, the rate soared to 5.11 percent from 2.984 percent.
"Portugal has once again managed to sell its debt but the rates are prohibitive," said Filipe Silva, a strategist at the Banco Carregosa.
Portugal must repay some 4.2 billion euros ($6.0 billion) of debt by April 15 and another 4.9 billion euros ($7.0 billion) by June 15.
"While we believe that the country has sufficient funds available for next Friday's redemption, we doubt that it is capable -- at the moment -- of meeting the June obligation," analysts at Lloyds Bank Corporate Markets told Dow Jones Newswires.
Significantly, Germany, the eurozone's paymaster, said Lisbon would only be able to approach the European Financial Stability Fund (EFSF) for help, ruling out any effort to arrange a bridging loan.
The EFSF was set up last year after fellow struggling eurozone member Greece had to be bailed out by the EU and International Monetary Fund and was used to mount a similar rescue for Ireland in November.
Meanwhile, a spokesman EU economic affairs commissioner Olli Rehn said the European Commission had not received any request from Lisbon for aid.
"I haven't seen, heard, sensed any sign of this coming from the Portuguese authorities," the spokesman, Amadeu Altafaj, said earlier Wednesday.
The finance ministry insisted Portugal would meet its debt payments.
"The current interest rates lead to the conclusion that the damage caused by the rejection of the (austerity) plan is irreparable," it said in a statement, insisting the country "is able to meet its scheduled financial commitments."
Moody's Investors Service on Tuesday downgraded Portugal's ratings by a notch from A3 to Baa1 and warned that it expected the country to have to seek outside help to resolve its debt problems.
"Pressure on Portugal to ask for external aid is mounting both internally and externally," said Tullia Bucco, an analyst at UniCredit.
The government denied that it had launched negotiations with its European partners to obtain emergency funding.
"The information is false. These are only rumours without foundation. We deny them, there no type of contact at all," a official in the office of Socialist Prime Minister Jose Socrates told AFP earlier Wednesday.