Whilst at the NSW Rugby Union, he led the organisation’s recovery from a significant debt position.
[5] In 2004, Carroll became the inaugural General Manager of Football Federation Australia's (FFA) A-League, a position he held until 2007.
[5] From September 2013 until August 2014, he was Executive Adviser & Interim Chief Operating Officer for the 2019 Rugby World Cup Organising Committee in Japan.
He was deputy to O'Neill in his two stints at the Australian Rugby Union and at Football Federation Australia.
[9] In employing Carroll at the FFA in 2004, O'Neill said "Matt has shown a huge amount of competency and with his broad skills of running a successful major event (Rugby World Cup 2003) and establishing better relations between the governing body of the sport and the grassroots.