The owners of Cadbury are seeking to cut 70 jobs at its production plant in Coolock in Dublin.
Representatives of trade unions SIPTU and Unite say they will meet management of Mondelez Ireland next week to discuss the threatened job losses.
The unions have described the move by management as unacceptable in light of the changes to work practices that were agreed to by workers as part of a restructuring in recent years.
It is understood Mondelez will seek the redundancies on a voluntary basis over the next two years.
"Our members are deeply unhappy with the announcement by management this morning that it is seeking 70 staff redundancies," SIPTU Organiser, Colm Casserly said.
"We are currently consulting our members prior to a meeting with management, which will take place at the earliest opportunity next week. At this meeting, SIPTU and Unite representatives will make clear our members' position and seek to minimise the number of job losses at the plant."
Mondelez employs over 350 people at the Coolock facility.
In a statement, it said that like all manufacturers, it keeps its operations under review to ensure its business is operating as efficiently and effectively as possible.
"We are proposing to invest €15m into Coolock to make the site more competitive in the future. As a result of these proposals some colleagues' jobs will be impacted," it said.
"We're now conducting a consultation process and will do all we can to support them moving forward."
