 Gillespie was named in the Ireland squad for the 2005 ICC Trophy and warmed up with his first century for Ireland, scoring 102 not out against the MCC in June.He played in five matches in the tournament itself, without much success until the semi-final against Canada, where he scored 64 not out to help lead Ireland to the final, winning the man of the match award in the process.Also in 2005, he played against Loughborough UCCE, Warwickshire and Yorkshire, in addition to playing in Intercontinental Cup games against the Netherlands, Scotland, the UAE and the final against Kenya, which Ireland won.