Aer Lingus has confirmed that two passengers also fell ill on the Boston flight forced to turn back to Dublin on Sunday after the cabin crew became unwell.
The airline has since canceled three trans-Atlantic flights after engineers grounded the Airbus plane involved in the incident.
The pilot made the decision to return to Dublin after two hours and 25 minutes when seven of the eight cabin crew felt sick.
Now the airline has told the Irish Times that two passengers also complained of feeling unwell.
The paper says they reported feeling ill after the aircraft returned to Dublin and were offered medical assistance.
An Aer Lingus investigation into the incident is ongoing after engineers checked out fumes in the galley area.
As a result of the plane being grounded for 24 hours, three transatlantic flights – to Boston and New York – have been canceled.
Some customers were forced to rebook flights.