Workers at the Hertz European Service Centre in Swords, Co Dublin have been told their jobs are at risk as the car hire company is considering outsourcing some of the roles based at the centre.
The company says "certain finance administration functions currently located at its European Service Centre in Swords are under review and may potentially be outsourced."
It says it will open a consultation process with staff and is just starting this process
There are 910 workers currently employed by the company in Swords.
It is not known how many may be affected by the move.