Fears are growing for 670 jobs in Killarney, Co Kerry as crane manufacturer Liebherr said it is reviewing its operations there.
Liebherr, which employs around 670 people at its factory in Killarney, Co Kerry, said the decision came after Labour Court recommendations that it pays a disputed increase to employees.
The German-owned company said it was "disappointed" by the recommendation and the actions of a "minority" of its employees had "seriously compromised" its future.
Around 300 SIPTU workers employed there had been involved in a dispute with management over the pay issue, which resulted in them staging a strike at the plant last month.
Liebherr says that as a result of the industrial action and the pay award, its cost base has been increased, resulting in work already being sent to its plants in Germany.
Last week the Labour Court recommended the firm award a 2.5pc pay increase, backdated almost two years, to its workers. It delivered a list of recommendations to both sides, which have been accepted by the company.
SIPTU says it is seeking clarification on the recommendations. The union had claimed the pay claim was owed under the National Partnership Agreement and should have been paid in January 2009.