"The Omicron COVID-19 variant and U.S. intervention in the oil market have created a vague situation," the source told Reuters, referring to a U.S. plan to release oil from its reserves to reduce prices that hit three-year highs in October.

OPEC+ has an agreement in place to add 400,000 barrels per day (bpd) a month to global supplies as it gradually unwinds last year's record supply cuts of about 10 million bpd, or 10% of global supplies, when demand had cratered.

(Reporting by Alex Lawler; Editing by Edmund Blair)