Career
He made his senior debut in November 2013 against the Dragons. In May 2014 it was announced that he would be promoted from the Leinster academy to the senior squad for the season 2014-2015. On 29 August 2015, Furlong made his Ireland senior debut against Wales in a warm-up game for the 2015 Rugby World Cup.
He was named in the Ireland squad for the World Cup on 1 September 2015.