"The probability of growth slowing even further, falling below two percent was one-in-four," said Georgieva at the Reuters NEXT conference Thursday, referring to the fund's recent expectations for 2023.
"When we look at the most recent indicators, we are concerned that this probability may be going a bit further up," she added.
The International Monetary Fund expects more than a third of the global economy to shrink this year or next, with the United States, European Union and China stalling.
Georgieva added that slowing growth in China is particularly significant.
Her comments come as the world's biggest economies grapple with fallout from Russia's invasion of Ukraine, which sent food and energy prices soaring, along with a surging inflation and China's economic forecast.
This is worrying given that the world has relied on China for a boost, with "some 35, 40 percent of global growth" coming from expansion in the world's biggest second economy.
"This is not the case now, it's not going to be the case next year," she said.
The IMF is set to give an update on its economic outlook in January, and it is among key global institutions to visit China next week for talks.
According to World Bank figures, the global economy slumped 3.3 percent in 2020 and 1.3 percent in 2009.