Staff at the Cadbury plant in Rathmore have been issued with protective notice.
The letters were given to staff at the east Kerry factory this morning.
A year ago parent company Mondelez International announced proposals to streamline the chocolate manufacturing businesses at Cadbury plants in Coolock, Dublin and Rathmore.
The streamlining proposals included job losses at both plants and a €11.7 million investment in Coolock.
The company says producing chocolate products here is up to four times more expensive than in mainland Europe and the proposals along with efficiencies aim to build a stronger business in Ireland.
SIPTU and UNITE which represents workers in both plants have rejected Labour Court recommendations and have an issue with the outsourcing of work at the plants for what they claim is lower pay.
A four per cent pay increase for all impacted staff is included in the court’s recommendation according to Mondelez.
Workers in Coolock are planning to strike next Thursday, March 3rd and protective notice has been issued to workers there and in Kerry advising that there’s the potential for lay offs if the industrial action goes ahead.
Mondelez says it remains open to talks with the workers.