	Carroll's performances in the holding midfielder role impressed supporters and manager Liam Buckley, making him one of the favourites along with Shane McFaul and Greg Bolger to fill the void left by James Chambers who departed to fierce rivals Shamrock Rovers during the transfer window. Carroll made his 50th appearance for St Patrick's Athletic playing at centre back in a 1–0 win away to Limerick at Thomond Park on 30 March 2013. He performed well at centre back and kept club captain Conor Kenna out of the team, starting there in the 1–0 wins away to Bray Wanderers and UCD. On 26 April, it was announced that Carroll had signed a contract to join Huddersfield Town from July 2013 for an undisclosed fee believed to be in the reign of €150,000. His next appearance came nearly a month after his move was secured, on 20 May 2013 when he played 120 minutes in a 3–2 win after extra-time away to Salthill Devon in the League Cup. Carroll's final two appearances for St Patrick's Athletic came on 1 and 4 June 2013 when he came on from the bench in a 4–0 home win over UCD in the FAI Cup and 120 minutes in a 2–0 win after extra-time over Longford Town in the Leinster Senior Cup Quarter Final, also at Richmond Park. Carroll left Pats with 58 appearances in all competitions over 3 seasons, scoring 3 goals. At the end of the 2013 season, St Patrick's Athletic awarded Carroll a League of Ireland medal for his contribution in the first half of the season towards winning the 2013 League of Ireland, the club's ninth league triumph.