The Diamond Princess has been docked in Yokahama for the past two weeks with more than 400 people testing positive for the virus.
There are also Irish nationals on board a second cruise ship in Cambodia that has been hit with the virus.
The Department of Foreign Affairs says its liasing with the relevant authorities to discuss the repatriation of Irish nationals.
The US has already flown its citizens home from Japan but Matthew Smith stayed on the ship because he didn't think it was safe:
