Some schools will have up to half of their teachers off work due to Covid when they reopen tomorrow.
The ASTI says there's a "strong possibility" some students will have to stay home due to staff shortages.
It said it expects chaos to ensue, as principals scramble to find substitutes.
Yesterday the Department of Education gave the go-ahead for classes to resume this week.
Further to meetings and discussions over Christmas and today with public health, HSE and education stakeholders, I can confirm that schools will reopen on Thursday (January 6th) for our students. (1/3)
— Norma Foley T.D (@NormaFoleyTD1) January 4, 2022
ASTI General Secretary Kieran Christie says "anything from 10 to 30, 40 or maybe even 50 percent of staff being close contacts or having Covid"
Education Minister Promises Extra Resources For Schools
Meanwhile, the Education Minister admits the reopening of schools will 'not be without challenge'.
Minister Norma Foley said that 'no two schools will be the same', adding that resources will be available to help schools with any challenges they face.
Education Minister Norma Foley says there is "a clear hierarchy of students".
She pledged "particular provisions" for special schools, special classes, younger students who cannot engage with remote working and exam students.
Minister Foley says schools will operate to their "absolute maximum capacity" when they reopen tomorrow.