Specific provisions in contracts of employment
In recent times, some employers are adding in specific provisions in contracts of employment that limit the ability of employees to work in a certain sector, with certain suppliers, clients, for a period following termination of employment. (For example, it may specifically state that the employee cannot work in a certain sector, with or for suppliers or clients of the former employer, etc.). There is nothing in employment law in Ireland that strictly forbids this, but there is no provision in employment law that allows this either.
Essentially, this is an issue of contract law - that is, the contract of employment signed and agreed between the employer and employee. If you have any concerns about this issue, you are strongly advised to seek legal advice from a competent legal professional in advance of signing this contract. However, even if the contract is signed, you are always free to seek such legal advice. Solicitors' fees in Ireland can vary widely so shop around and obtain some quotes for legal advice before you proceed.