Burger King says it will vigorously defend accusations that it ran a secret campaign encouraging employees to resign from a union.
The accusations have been made by the Unite union, which has filed legal proceedings with the Employment Relations Authority.
Burger King says it is unable to comment while the matter is before the authority, but it will contest the matter vigorously.
Unite is seeking penalties from the company, saying it set targets to see how many employees could be encouraged to give up union membership.
Unite has also publicly accused Burger King of exploiting migrant workers, however the company says those accusations are not made in the documents filed with the Employment Relations Authority.