If Argentina's center-left opposition wins the presidential elections and closes its economy with protectionist policies, Brazil will pull out of Mercosur, Economy Minister Paulo Guedes said on Thursday.

Opposition candidate Alberto Fernandez received nearly 48 percent support on Sunday in Argentina's primary vote, considered an important bellwether ahead of the general elections on October 27. Conservative incumbent Mauricio Macri, an ally of far-right Brazilian President Jair Bolsonaro, took just 32 percent of the vote.

Bolsonaro and Macri have assured Brazil and Argentina remain committed trade partners, but for how much longer?

Goodbye Mercosur?

Alberto Fernandez's vice presidential candidate is former Argentinian President Cristina Fernandez de Kirchner, who adopted protectionist policies during her tenure from 2007 to 2015.

"We cannot get hung up on the crisis in Argentina," Guedes said at an event in Sao Paolo hosted by Santander bank. "Of course Mercosur is a vehicle for Brazil's integration into international trade. But what if Kirchner wants to come and close their economy?"

If that happens, he added, Brazil "will leave Mercosur."

Brazil and Argentina, along with Uruguay and Paraguay, make up the Mercosur trade bloc. Bolsonaro and Macri recently helped Mercosur sign one of the world's biggest free trade deals with the European Union after 20 years of negotiations. Both of their respective governments have expressed interest in signing a similar agreement with the United States.

Read more: EU-Mercosur free trade deal — What you need to know

Watch video 02:41 Share Who wins in EU-MERCOSUR trade? Send Facebook google+ Whatsapp Tumblr linkedin stumble Digg reddit Newsvine Permalink https://p.dw.com/p/3M85o The winners and losers of the EU-MERCOSUR trade deal

'Foreign trade is a warning sign'

Guedes also questioned how economically reliant Brazil was on Argentina. Macri's setback at the polls was largely attributed to the country's recession, high inflation and unemployment.

"Foreign trade is a warning sign, but our main concern is internal," Guedes said. "Brazil is a continental economy, and we need to recover our own growth momentum. We are not so dependent on others."

Were Macri to retain power, he added, it would help to open markets thanks to the "excellent chemistry" between the Argentinian president, Bolsonaro and US President Donald Trump.

Bolsonaro has said that if his political ally is defeated, and the Argentinian left returns to power, it could unleash a wave of Argentinian migration to Brazil.

dr/kl (dpa, Reuters)

Every evening, DW's editors send out a selection of the day's hard news and quality feature journalism. You can sign up to receive it directly here.