 O'Reilly joined the Limerick senior hurling panel in 2018 and made his first appearance for the team during the pre-season Munster League.He made his first appearance in the National Hurling League on 4 February 2018 in a 1-24 to 0-10 defeat of Offaly at O'Connor Park.On 19 August 2018, O'Reilly was a member of the extended panel when Limerick won their first All-Ireland title in 45 years after a 3-16 to 2-18 defeat of Galway in the final.