After gaining selection for the Country New South Wales rugby league team and then the New South Wales team in 1963, Harrison was selected to go on that year's Kangaroo tour and be part of the first Australian side to win The Ashes in England.
After gaining selection for the Country New South Wales rugby league team and then the New South Wales team in 1963, Harrison was selected to go on that year's Kangaroo tour. He was selected to make his debut, becoming Kangaroo No.378 and was part of the first Australian side to win The Ashes in England.