Vessel movements will be hit at all Greek ports as tug crews take strike action.
The four-hour stoppages will take place on Thursday and Friday, Inchcape Shipping Services said.
The strike has been announced by the Crew Union of Towage Companies, which is protesting against the planned privatisation of Piraeus and Thessaloniki ports.
Crews will stop working between 0600 and 1000 local time on both days.
Ships
