Opposition presidential hopeful Alberto Fernández has said in local press interviews that the country is "virtually" in default and that Argentina should renegotiate its bailout loan agreement with the International Monetary Fund (IMF).
Fernandez, a Peronist whose running-mate is former president Cristina Fernández de Kirchner, trounced President Mauricio Macri by a 15-point margin in the PASO primary elections held August 11.
The shock result sent financial markets into a tailspin, prompting Macri to promise salary hikes and tax cuts, back-pedaling on his unpopular IMF-backed austerity programme.
On Saturday, Finance Minister Nicolás Dujovne resigned in the wake of the debacle and was replaced by Hernán Lacunza, a respected economist with broad political ties.
Macri negotiated a US$56-billion bail-out from the IMF in 2018 to steady turmoil in the currency market, but after last week's election rout the peso plunged 20 percent and Argentine stocks lost 30 percent.
Fernández pointed to Argentina's debt default in 2001 as an example of how to handle the current situation.
"Argentina should fulfill its obligations," he said. But he recalled that after the last default, the country negotiated with its creditors "one by one."
"We have to sit down to discuss it one by one, as we did with the debt at that time. Remember that we asked bond holders to accept a 75 percent discount."
In an interview with La Nación, Fernández said, "The only apparent solution is to postpone the dates" when debt payments are due.
Fernández also appeared to put in doubt a trade deal reached recently between the EU and the South American trading bloc Mercosur, of which Argentina is a member along with Brazil, Paraguay and Uruguay.
"The treaty does not exist," he said. "What exists is a series of points to be agreed which will require two years of negotiations."
"What I am going to do with the agreement... (is) take it up, study it, try to extract the best advantages for Argentina, reject the harmful things. And if we can reach an agreement, welcome."
Brazilian Economy Minister Paulo Guedes warned last week that Brazil would withdraw from Mercosur if Fernandez is elected and attempts to close the trading bloc.
Fernandez dismissed those concerns as "silly."
"If [Brazilian President Jair] Bolsonaro thinks that I am going to close the economy and that Brazil will then leave Mercosur, he can rest easy, because I'm not thinking of closing the economy," Fernández said.
Referring to Bolsonaro, Fernández said "the manner and arrogance with which he speaks, among other things, bother me. But the truth is Brazil is much more important than Bolsonaro."