The Football Association of Ireland (FAI) has released details of a probe into a cyber attack on its computers in June.
The breach happened over the June bank holiday weekend at the FAI's Abbotstown headquarters.
The group said it "immediately engaged external computer forensic experts" when it became aware of the incident.
The investigations found malware on a payroll server in the system.
However, the association said there was no evidence of any staff data being extracted from the server.
The forensic computer experts also told the FAI that other "critical online services" - including the FAInet system which handles all player registration details - have not been affected in any way.
The FAI said they treated this matter "very seriously" and are focused on closing out this incident and preventing any further security incidents.
In a statement, the FAI said: "The association again assures customers that no breach of payment details took place as such data is stored off-site.
"FAI ticket sales are also processed and paid for via a third party platform."
The Office of the Data Protection Commission has been notified of the incident, as well as FAI efforts to ensure that no data was adversely impacted.