The Lansdowne FC man had a break through season for the club in 2014/15 as they went on to win the UBL championship. During the season he was called up to the Leinster squad for a trip to Edinburgh and also featured for Ireland against the Barbarians. Kelleher is in Leinster's squad for the 2015/16 season.
After spending two seasons in the Leinster Academy and making seven PRO12 appearances, he signed with Connacht Rugby on a two-year deal.
He has since been involved with the national side but is yet to make his test debut and has played 29 times for Connacht in the Pro12/14
He rejoined Leinster ahead of the 2019/20 season
|2015 - present|
|Landsdowne 1st Team
|2014 - 2015|
|2015 - 2015|
|2016 - 2019|