[5] He made his début for Ireland in 2012 and was a member of the squad for the 2013 Rugby League World Cup, making one appearance from the bench at the tournament in their defeat by Fiji.

At the end of the 2016 season Haggerty retired from playing at the age of 27 in order to take up a coaching role with Toronto Wolfpack.

[6] In 2013 whilst a player for the Barrow Raiders, Haggerty was appointed head coach of leading amateur club, Pilkington Recs competing in the National Conference League in Division 3.

In February 2016 he guided the team to their first ever Challenge Cup win over professional opposition, beating London Skolars 13-0 in the Third Round.

[7] On 23 August 2021, Leigh recorded their first victory under Haggerty in the 2021 Super League season after losing the previous 16 matches in the competition beating Salford 32-22.