Councillor Donagh Killilea will join sitting TD Anne Rabbitte on the Fianna Fáil ticket in Galway East.
The party will now run two candidates in the three seat constituency where sitting TDs Ciaran Cannon and Seán Canney are fighting to retain their seats.
The party has now decided to add the Tuam based councillor being to the General election race.
He is the third generation of a political dynasty with both his father and grandfather serving as TDs.
His late father Mark Killilea had a decorated political career serving as a county councillor, Senator and MEP as well as a TD.