There is speculation that around 100 jobs are to be lost at Merck Sharp and Dohme (MSD) in Brinny in Co. Cork.
Staff at the pharmaceutical plant near Inishannon have been called to a meting today at which details will be announced.
It is not clear how the job losses will be achieved.
Merck has a total of 7 plants in Ireland with over 450 people employed at the Brinny site.
The Cork plant was established in 1980 and specialises in the fermentation, purification and sterile filling of Biotech products.
It also produces new products which are used at a global level in clinical studies.
The company says that products produced in Brinny earn in excess of €2 billion sales per year and are exported to 90 countries across the globe.
The group provides innovative medicines, vaccines, biologic therapies and health products and has customers in 140 countries.
The company is known as MSD worldwide except in the United States and Canada where they are known as Merck.
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