Brent crude oil futures were at $66.79 per barrel at 0022 GMT, down 29 cents, or 0.4 percent, from their last close.
U.S. West Texas Intermediate (WTI) futures were at $58.68 per barrel, down 37 cents, or 0.6 percent, from their last settlement.
"Inflation expectations have risen," said U.S. bank Morgan Stanley.
"Estimates for growth and earnings have been revised down materially across all major regions."
ANZ bank said the darkening economic outlook "overshadowed the supply-side issues" the oil market was facing amid supply cuts led by producer club OPEC as well as the U.S. sanctions on Venezuela and Iran.
The Organization of the Petroleum Exporting Countries (OPEC) and non-affiliated allies such as Russia, together referred to as 'OPEC+', have pledged to withhold around 1.2 million barrels per day (bpd) of oil supply this year to prop up markets, with OPEC's de-facto leader seen to be pushing for a crude prices of over $70 per barrel. - Reuters
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