The Gardai say the National Economic Crime Bureau are investigating allegations of match fixing at Bray Wanderers.
The fraud squad confirmation came on the back of reports that five games are now being probed.
The FAI launched an investigation into the 5-0 friendly loss to Waterford last week after a complaint was lodged to the association.
According to the Irish Sun, four other games are now being linked to the Garda investigation, including three League of Ireland ties.
Bray Wanderers return to action tonight by welcoming Limerick to the Carlisle Grounds.
That's one of three Premier Division ties, with Drogheda United facing Bohemians and Galway United hosting Derry City.
All those games kick off at 7.45pm.