Public Health has partnered up with TasPorts, the two organisations managing a cargo vessel that's berthed at Bell Bay.
All 21 crew members onboard the African Rook have been identified as primary close contacts of a Victorian Coronavirus case.
The stevedore had worked on the vessel in Geelong on September 17, later producing a positive result to a COVID test.
The ship is docked in a secure port zone, all crew were tested on board on Saturday September 25.
All have since returned negative test results.
The crew members will stay on board and carry out 14 days worth of quarantine, coming out again on October 1.
They will be retested before the vessel is allowed to continue its journey.
Public Health say confirmation of the crew’s status was received on 20 September after the vessel had departed Geelong and as it reached Tasmanian port limits.
It was scheduled to arrive at Devonport to discharge cargo.
Following consultation with TasPorts, and appropriate due diligence and risk assessment, the vessel was diverted to the port of Bell Bay on September 25.
Public Health say there is no risk to the Tasmanian community.
The crew remained on board at all times and had no contact with members of the public.