Teachers may be stopped taking career breaks to deal with shortages.
Due to the pressure on substitute teacher availability, non-statutory breaks may be considered.
Some trainee teachers who've done work placement may also be drafted in over the next few weeks.
Karen Jordan is a principal of St Catherine's National School in south Dublin, she said she's worried about getting calls from her teachers:
"I fear when I see staff ringing on a Sunday evening . So I don't know who's going to be in or who's going to be out, it's the daily juggle. The children are losing out, the staff themselves are under pressure, and I don't know what the quick fix is, there is no quick fix."
