McCallan made his debut for Ireland on 2 June 1996, playing against Wales in Dublin, taking a wicket with his first delivery. He scored his first century in his following match, against the MCC in Malahide.
McCallan's debut for Ireland occurred on June 2, 1996, in Dublin against Wales. He took his first wicket with his very first delivery and scored his first century in his subsequent match against the MCC in Malahide.