 On 17 March 2016, O'Neill managed Na Piarsaigh to the All-Ireland Championship medal when the club defeated Ruairí Óg by 2-25 to 2-14 in the All-Ireland final.On 15 October 2017, O'Neill guided Na Piarsaigh to a third county final in four seasons.He claimed his second championship as manager following the 1-22 to 2-14 defeat of Kilmallock.