There are fears that frontline health services could be under threat with the HSE seeking to make more savings from the Haddington Road Agreement.
Senior HSE management are meeting with unions tomorrow to discuss plans for new measures, which could include longer hours for no extra pay.
The Health Service has already told the Government there is likely to be a €78m shortfall on the €290m target set for savings this year.
It is being reported that frontline staff are likely to be targeted as it seeks to make up the balance.