The FAI have revealed that an attempt was made last weekend to hack the association's computer servers.
In a statement released on Wednesday evening, the FAI said they had informed an Garda Siochana and the Data Protection Commission of the breach.
The association said that no breach of payment details took place as this data was stored off-site. They added that details related to ticket sales were unaffected as they are also handled by a third party.
The statement said the "external hacking" attempt had impacted on email services, though these were now partially restored. Forensic computer scientists are on site at Abbotstown looking into the problem.
"The computer servers of the Football Association of Ireland, located at its Abbotstown headquarters, were the subject of external hacking over the weekend.
"The Football Association of Ireland has informed both an Garda Siochana and the Data Protection Commission of the breach. The Association 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.
"Email services at the Association were affected by the external attack but are now partially restored. Forensic computer scientists are on site and work is continuing to restore a full service for staff."