Casey first came to prominence as a member of the Dublin minor team that won back-to-back
Leinster Championship titles in 1960 and 1961. While still eligible for the minor grade he was drafted onto the Dublin junior team before making his senior debut against
Laois in the
National League. Casey won
Leinster Senior Football Championship medals in 1963 and 1965. He was part of the team that beat
Galway to win the
1963 All-Ireland final. He also claimed a
County Championship title with
Na Fianna in 1969. ==Honours==