[1] He played football for Kildare GAA club Moorefield but his career was cut short by serious back injury.
[5] O'Neill was a member of Liam Sheedy's management team that won the 2009 Munster Senior Hurling Championship.
The team also reached the 2009 All-Ireland Senior Hurling Championship Final but lost to Kilkenny.
O'Neill was also the Tipperary trainer when the county won the 2010 All-Ireland Senior Hurling Championship Final and was runner-up in 2011.
[citation needed] He joined the Galway county football team as coach under the management of Pádraic Joyce ahead of the 2022 season.