The Irish branch of the International Transport Federation has warned Irish Ferries that two Filipinas hired on low wages to work on the MV Normandy must be reimbursed.
The women, who have returned to the Philippines, must be paid on terms similar to those awarded to another Filipina, Salvacion Y Ortenero Orge, who had been hired as a beautician on the MV Isle of Inishmore at just over €1 an hour, said Tony Ayton, the International Transport Federation's Irish branch spokesman.
Ms Orge was at the centre of a stand-off last month between the ferry company and Siptu over her payment. She was repatriated after a confidential settlement with the ferry company, believed to be about €25,000.
Fellow Filipinas Cynthia Archilla and Jovita Corporal were hired to work on the MV Normandy on similar contracts and were repatriated without union intervention.
Mr Ayton says his union has now been empowered to act for the two women, however.
The union has called on Irish Ferries to ensure that both women are awarded "not less favourable" payment than that given to Ms Orge, in addition to any money already paid to them by the agent, CF Sharp.
The International Transport Federation says there should be "no undue delay" in making the payment, and there should be no direct contact with the women.
It also calls on the ferry company to "take all lawful steps possible to ensure that no person or organisation within your power of influence takes any steps that would adversely affect their future employability.
"The circumstances that justified the public and private apology and the additional payments to Ms Salvacion are every bit as valid for Ms Archilla and Ms Corporal.
"Consequently, treating them any differently now would be and injustice," Mr Ayton says in a letter to Irish Ferries.
Irish Ferries said yesterday that it was fully discharging its contractual obligations to the women's employer, CF Sharp, and had agreed to honour fully all such obligations. CF Sharp was fully approved as a supplier to the marine industry by the International Transport Federation, an Irish Ferries spokesman added.