 Fennelly's backroom team included Michael Kavanagh, David Kenny and Johnny Kelly.On 30 November 2019, Fennelly took charge of the Offaly senior team for the first time when he guided the team to a 2-28 to 0-18 defeat of Kildare in the Kehoe Cup.On 12 January 2020, he claimed his first silverware when Offaly defeated Antrim by 1-16 to 1-15 to win the Kehoe Cup.