After playing just four senior internationals for Ireland, Miller was selected by the British and Irish Lions for their 1997 tour of South Africa. He played in five games during the tour, lining up against the Border Bulldogs, Northern Transvaal, and the Free State Cheetahs. A bout of flu saw him miss the first test against South Africa but he recovered in time to feature in the second test on 28 June 1997. However injury saw him miss the third test. At 21 he was youngest member of the touring party.