The country's largest public service trade union IMPACT has said that it does not accept new proposals to cut sick pay entitlements for civil servants.
The Government wants to cut its sick pay bill by altering the current arrangement which allow workers to take 12 months paid sick leave - half of it on full pay.
The Government proposals would cut the entitlement to three months on full pay and three months on half pay.
IMPACT says it will oppose the measure on the grounds that it wants to protect sick pay for staff with serious long-term illnesses.