||Born in Sandymount, Dublin, the 26-year-old will join the Trailfinders after making 26 appearances for the four-time European Champions, scoring 12 tries in the process.
After initially coming through Leinster's academy, Kelleher had a three-year spell with Irish rivals Connacht, before returning to Leinster for the 2019–20 season.
6 ft tall Kelleher has represented Ireland internationally in Sevens. He also played for the Ireland under-20s in the 2014 Under-20 Six Nations and at the 2014 Junior World Championship, scoring three tries in nine appearances. Kelleher made his first appearance for the Irish senior side in an uncapped match against the Barbarians on 28 May 2015.