[3] In Gaelic football, he played as a defender, midfielder and forward.
[4] In association football, Withnell won the League of Ireland Premier Division with Dundalk in the 1994-1995 season.
[5] He had previously played for Northern Irish lower league side Kilmore Rec.
At the end of the 1998–99 season he scored once in the first match and a hat-trick in the second match of the relegation playoff against Ards, ensuring his club avoided relegation.
This biographical article relating to Northern Irish association football is a stub.