 An ongoing back injury hindered Fennelly's championship campaign in 2015, resulting in him missing Kilkenny's 1-25 to 2-15 defeat of Galway in the provincial decider.Fennelly fought his way back to full fitness as Kilkenny subsequently renewed their rivalry with Galway in the All-Ireland decider on 6 September 2015.The team struggled in the first half, however, a T. J. Reid goal and a dominant second half display, which limited Galway to just 1-4, saw Kilkenny power to a 1-22 to 1-18 victory.