The Department of Transport has declared that there are no safety issues on board a giant tanker in the Shannon Estuary.
It said the tanker is free to continue its journey to New Orleans and Panama.
The Pioneer Atlantic, a 7,000-tonne freighter, had docked at the Aughinish Alumina plant last weekend to offload a cargo of oxide.
Members of the mostly Filipino crew contacted the International Transport Workers' Federation about safety concerns and working conditions on the ship.
The tanker was visited by two SIPTU officials on behalf of the ITWF, who found that the 25 crew had concerns about fresh food and drink provisions.
They also voiced concerns about engine problems, excessive working conditions and fatigue.
The department said the ship was visited by a Port State Control Officer from its marine survey office, who concluded the vessel was in a satisfactory condition, including the food and provision provided for the crew.
Senior engineer officers were also asked if there were any safety issues that would be sufficient to concern them and they said there were none.
The department said the vessel will not be further inspected or prevented from continuing its normal scheduled commercial operations.
The tanker is expected to continue its journey once crew members who opted to go home to the Philippines are replaced.
Two left the ship on Tuesday and another five were due to leave today.