The ship in question named the MV Overseas Yellowstone came from Gabon with a cargo 725,000 barrels of crude oil.
Gabon currently has no confirmed cases of Ebola, nor is it on any watch list for the virus.
Petrotrin said the ship berthed at a single point , approximately 10 miles off Gabon’s shore to receive the cargo and then sailed directly to Trinidad.
Petrotrin stated the ship with its cargo was anchored offshore Pointe-a-Pierre on Friday 2014 October 17.
It disclosed that a Health Clearance Certificate was obtained from the Ministry of Health on October 17 stating that the vessel was found to be free from infection or contamination.
The company said it informed Oilfields Workers Trade Union (OWTU) members of the developments and it was agreed that there was no issue preventing employees from berthing the vessel.
Petrotrin said employees refused to work throughout its port operations.
Petrotrin added this incident has put the company in a difficult position.