On 2 March 2011, Morrissey won a Leinster Championship after lining out at left wing-back when St. Kieran's College defeated Castlecomer Community School by 3-07 to 0-07.
[2] He was switched to left corner-back for the All-Ireland final against Ardscoil Rís on 2 April 2011 and ended the game with a winners' medal after the 2-11 to 2-08 victory.
[3] On 3 March 2012, Morrissey won a second successive Leinster Championship medal with St. Kieran's College following a 2-09 to 1-10 defeat of nearby rivals Kilkenny CBS in the final.
On 4 November 2012, Morrissey was just out of the minor grade when he lined out at midfield when Bennettsbridge qualified for the Kilkenny Junior Championship final.
On 9 November 2014, Morrissey won a Kilkenny Junior Championship medal after lining out at centre-back in a 1-17 to 1-07 defeat of Mooncoin in the final.
[5] He retained his position at centre-back for the Leinster final on 6 December 2014 and ended the game with a winners' medal after the 1-20 to 0-03 defeat of Shamrocks.
On 18 October 2015, he captained the team when Bennettsbridge drew 0-20 to 3-11 with St Patrick's Ballyragget in the Kilkenny Intermediate Championship final.
[14] On 1 July 2018, Morrisey scored a point from left wing-back when Kilkenny drew 0-18 apiece with Galway in the Leinster final.