Born in St. John, New Brunswick, John Casey played college football at the University of Toronto. Casey joined the Toronto Argonauts in 1958 and played four seasons (1958-61) for the double blue as an offensive lineman.
| Year | Team | GP |
|---|---|---|
| 1958 | TOR | |
| 1959 | TOR | |
| 1960 | TOR | 12 |
| 1961 | TOR | 13 |
Official games played stats were not kept in the East until 1960. The Toronto Argonaut all-time roster lists Casey as having played 52 regular season games and three playoff games during his career.