He was drafted by the Chicago Cardinals in the 31st round ( 289th overall pick ) of the 1947 NFL Draft .
In January 1947 , Callahan announced that he was leaving school and hoped to play professional football .
Callahan was drafted by the Chicago Cardinals in the 31st round ( 289th overall pick ) of the 1947 NFL Draft .
In January 1947 , Callahan announced that he was leaving school and hoped to play professional football .