The Liberia-registered tanker Equator left the rebel-held east Libyan port of Marsa el Hariga three weeks ago, carrying cargo vital to financing the uprising against Muammar Gaddafi.
"The Maritime and Port Authority of Singapore has received pre-arrival notification that the tanker Equator will be calling at the Port of Singapore on April 28," said an agency spokeswoman.
"Equator will be granted port clearance for entry so long as the vessel meets normal statutory requirements," she added.
The oil tanker was expected to make a brief stop in Singapore to refuel and then depart for a Chinese port, either Ningbo or Dalian, traders and shipbrokers said.
The buyer of the cargo, which is being managed by trading house Vitol, was not immediately clear. Vitol has not commented on its Libyan transactions.
The rebels' Libyan National Council, with the help of OPEC member Qatar, has been able to export a minimal amount of crude oil and has requested international help to continue overseas shipments.
More than a month of air strikes in a British and French-led NATO mission have failed to dislodge Gaddafi or bring major gains for anti-government rebels who hold much of east Libya.