 On 19 July 2008, Coleman made his championship debut for Cork when he came on as a substitute for the red-carded Donal Óg Cusack in an All-Ireland qualifier against Galway.In spite of Coleman being overlooked in favour of Anthony Nash as a late substitute for Donal Óg Cusack in the National League semi-final against Tipperary, he was named as first-choice goalkeeper for the subsequent final against Kilkenny.Coleman had a disappointing game in which he was caught out for an early goal, failed to rise the sliotar properly when taking a free, before making a couple of nervy saves in a 3-21 to 0-16 defeat.