The coronavirus outbreak may curb demand for oil in China and other Asian countries, further depressing oil prices to as low as $57 a barrel, the Institute of International Finance has said.

It also warns that the development clouds growth prospects across the Middle East.

"Before the coronavirus we were assuming that oil prices would average $60 a barrel this year, compared to $64 last year," said Garbis Iradian, chief economist for the Middle Eastand North Africa (MENA) at the finance industry body.

"Most likely we'll revise our forecast for the whole year, it could be $58 or $57 depending on developments of coronavirus."

His comments underscored growing concerns about the economic impact of the virus that will dominate the meetings of finance officials from the world's 20 largest economies this weekend in Riyadh.

Iradian said the virus outbreak could depress China's growth by 0.5 to 0.7 percentage points. 

That would have a dramatic impact on crude prices, which on Friday fell to $57.75 a barrel, as a rise in new cases fueled economic uncertainty.

"If the growth rate (for China) is 5% then it has major implications for oil. The Chinese demand for oil could drop by around 400,000 barrels a day, and other Asian countries could lower their demand.

Overall the increase in global demand for oil, instead of being 900,000 barrels per day "could be 300,000 to 400,000," he said.

This may impact economic growth in the Middle East, though a direct impact on regional economies, particularly for oil exporters, has so far been contained, he said.

A draft communique prepared for the G20 meeting at the weekend said financial leaders of the world's largest economies expect a modest pick up in global growth in 2020 and 2021 due to a continuation of "accommodative" financial conditions and signs of easing trade tensions.

But it said the coronavirus outbreak, which has killed more than 2,000 people and crippled the Chinese economy through drastic curbs on travel and commerce, posed a downside risk to the economic outlook.