A teaching union has called on the Stormont Executive to take urgent action to reduce any further disruption in schools due to Covid-19.
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NASUWT said its members want to be able to provide face-to-face teaching in the new term which begins this week.
Justin McCamphill from the union said the executive must do all it can to prevent schools from experiencing "significant staffing problems".
There has been a surge in cases of the Omicron variant in Northern Ireland.
On Thursday, Stormont ministers were told that the Omicron variant now accounts for about 90% of cases in Northern Ireland.
"We are calling on the executive to urgently intervene in schools to make sure they're safe," Mr McCamphill said.
"Over the new year we have seen a big increase in the number of cases with the Omicron variant so we're expecting a big amount of disruption in schools when they return this week.
"Unfortunately, that will mean many classes and year groups will be sent home."
Before Christmas, some schools had to send individual year groups home for remote learning on specific days due to staff absences and difficulty getting substitute teacher cover.