The mother of one of the young men is from Laois.
The families of two teenagers who died on a Leaving Cert holiday are said to be dealing with "immeasurable loss".
Andrew O'Donnell, who's mum is from Mountmellick, and Max Wall died in Greece in two separate incidents over the weekend.
The 18-year-olds were among almost 90 students from St. Michael's College in Dublin to visit the island of Ios.
The school is open to support students, while the Department of Foreign Affairs is providing consular assistance.
Chair of the board of Directors at the Spiritan Education Trust, Pat Kitterick, says he's thinking of those affected:
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