 Fahey scored his first goal for the Republic of Ireland eight minutes into his competitive debut, coming off the bench to score the only goal in a Euro 2012 qualifying win over Armenia in Yerevan on 3 September 2010.On his first competitive start, in a 1–1 draw against Slovakia in Žilina on 12 October, Fahey delivered the free kick that led to Ireland's goal, scored by Sean St.Ledger.