Gardaí are describing the incident as "serious".
Investigations are underway following an assault in a midlands night club over the weekend.
A woman was attacked on the premises in Mullingar on Friday night.
Gardaí are describing the offence - a Section 3, assault causing harm - as on "the more serious end of the scale".
Investigators have a definite line of enquiry thanks to CCTV footage.
However, anyone with any additional information is asked to contact Mullingar Garda Station on 044 938 4000.