BUENOS AIRES — Argentina's new finance minister made stabilising the country's battered currency his top priority on Tuesday, while still pledging to meet commitments made to the International Monetary Fund, which is sending a team to Buenos Aires.

Hernan Lacunza, a former central bank governor, said "guaranteeing the exchange rate is a first-order objective."

The Buenos Aires stock market shed 10.45 per cent by the close following Lacunza's comments.

The peso -- which lost 20 per cent of its value last week as markets reacted to a crushing primary election defeat for business-friendly President Mauricio Macri – showed no signs of a bounce.

The currency rebounded from early losses to close 1.26 per cent higher at 57.39 to the dollar.

Lacunza's arrival would ease short-term tensions, but "Argentina's situation is still delicate and the stock market is not going to recover at the same rate as the exchange rate," Economist Matias Rajnerman of Ecolatina said.

Lacunza assumed his new role on Tuesday as replacement for Nicolas Dujovne, who resigned after Macri's unexpectedly heavy defeat in nationwide primary elections seen as a bellwether for October's presidential election.

"We will guarantee compliance with the fiscal targets," he told a news conference after being sworn in by Macri.

"Allowing more volatility would only add uncertainty and inflationary pressure," said Lacunza, the economy minister of Buenos Aires province before Macri summoned him to take over from Dujovne.

An IMF spokesman said on Tuesday the Washington-based lender would shortly send a mission to Buenos Aires.

"We are closely following recent developments in Argentina and are in ongoing dialogue with the authorities as they work on their policy plans to address the difficult situation that the country is facing," IMF spokesman Gerry Rice said in a statement.

Lacunza has ‘tough job'

Lacunza "has the tough job of trying to come up with more measures like those announced last week, while trying to calm investors and secure IMF help", analysts Eurasia said in a note.

Macri reacted by announcing salary hikes, tax cuts and an increase in pension allocations, in a bid to win back voters.

But ratings agencies downgraded Argentina's debt on Friday, as investors fled the country and the outlook deteriorated.

Populist Peronist candidate Alberto Fernandez, now the clear favorite to unseat Macri, has questioned the reform programme backed by a US$56 billion IMF rescue package.

He said the country is "virtually" in default and should renegotiate the IMF loan.

The country is currently in a recession and posted 22 per cent inflation for the first half of the year -- one of the highest rates in the world.

However, the IMF had praised the Macri administration's performance, and said the belt-tightening reforms were starting to yield results that would spur economic growth.

The fund has released just over $44 billion so far as part of the three-year loan programme, but many economists have said the amount is not enough to stem the tide of Argentina's economic woes.

Dujovne, minister since January 2017 and closely associated with the IMF deal, was seen as responsible for the economic adjustment that led to the election collapse.

Also on Tuesday, Central Bank chairman Guido Sandleris warned that the recent exchange rate shock was having "a negative impact on prices." But he said the bank would continue to act to halt the currency's slide.

"Inflation will rise unfortunately in September and October," Sandleris told reporters. — AFP