My Department assists with the implementation of public health measures in relation to international travel, as decided by Government following relevant advice.
All requirements for arriving passengers are published on the Government's website
https://www.gov.ie/en/publication/b4020-travelling-to-ireland-during-the-covid-19-pandemic/
If a citizen has a genuine humanitarian emergency requiring urgent travel, and are not be able to obtain evidence of a negative pre-departure RT-PCR test in time, they should contact the nearest embassy or consulate immediately for advice and consular assistance.