Alexis Tsipras

Government spokeswoman Olga Gerovassili told Greek state TV ERT on Sunday that "as things stand now, Sept. 20 is a feasible election date."

Prime Minister Alexis Tsipras resigned Thursday. Opposition leader Evangelos Meimarakis, who was asked to form a government, is expected to inform Greek President Prokopis Pavlopoulos Monday that he has failed.

Tsipras resigned late Thursday and called an early election next month to deal with a rebellion in his radical left Syriza party over the terms of Greece's new bailout deal.

Investors have been gripped by an increasing sense of unease this week, largely because of the uncertainty related to China. Since early summer, Chinese stocks have taken a battering but global markets haven't responded much — until now.

Following last week's decision by the country's monetary authorities to reduce the value of the yuan, China's currency, stock markets have really taken a hit.

The officials, who spoke only on condition of anonymity pending an announcement by the prime minister, said the snap polls would be held on Sept. 20.

Tsipras was to make an announcement Thursday night, another government official said, while he was expected to also visit the country's president — a necessary formality in calling early elections, for which he would have to step down as prime minister.