Carnival Vista is due to arrive June 20 for an overnight stay and turnaround, and a spokesperson for Carnival Cruise Line told Seatrade Cruise News a contingency plan is in place that will allow the ship to make the call.
Princess Cruises, Royal Caribbean and other cruise lines have successfully visited Athens in recent weeks during the strikes.
Royal Caribbean's only turnaround in June is Azamara Journey, planned to go ahead as scheduled June 23.
Some 67,000 cruise passengers are expected in Piraeus in June, 45,000-50,000 on transit calls and 25,000-30,000 from homeporting ships.
As reported earlier, dockworkers are protesting job losses under the concession contract signed by Greece’s privatisation agency, Taiped, and China’s logistics giant Cosco Pacific, under which Cosco is buying a 67% stake in the Piraeus port, a deal worth some $700m.