The vessel, fully laden with oil, had previously been heading to the port of Kalamata in southern Greece but Greece had said it would not offer any facilities to the tanker.
Shipping data on Saturday had then indicated the vessel was to dock at the southern Turkish port of Mersin on August 31.
Iranian tanker switches destination, heads to Turkey: ship-tracking data
On Monday, Refinitiv Eikon data did not specify any destination for the Adrian Darya. Its location is currently south of mainland Greece, west of the island of Crete.
The Adrian Darya, formerly called Grace 1, was released in mid-August from detention off Gibraltar after a five-week standoff over whether it was carrying Iranian oil to Syria in violation of European Union sanctions.
The United States, which says the tanker is controlled by the Iranian Revolutionary Guards, deemed a terrorist group by Washington, has told countries in the region not to assist it.
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