Negotiations over money owed to a number of Indian nationals working on a vessel in the North Sea area said to be ongoing.
The Malaviya Seven was detained last month after it was first stopped in June over claims staff had not been paid for months.
The Mumbai-registered ship, which was charted in the first half of June by oil major BP, was allowed to leave the harbour in August after a pay deal was settled.
The International Transport Workers’ Federation (ITWF) previously said it was considering legal action.
The organisation had previously provided crew with assistance the first time the Malaviya Seven was held.
At the time of its first detention, the RMT union had said the incident was an example of “modern day slavery” while Aberdeen MPs Callum McCaig and Kirsty Blackman wrote to Home Secretary Theresa May calling for a full investigation.
The vessel’s sister ship, the Malaviya Twenty, was also detained in June, but not in Aberdeen. It was held by authorities in Great Yarmouth.