Treacy started the season well when he scored his first goal of the season and his first appearance of the 2013–14 season, just three minutes after coming on as a substitute, in a 3–0 win over Yeovil Town on 17 August 2013. After the match, Treacy praised Dyche for putting his career on track and credited the fitness coach Mark Howard for helping him lose weight and improving his physique. Treacy then set up a goal for Jason Shackell on 31 August 2013, in a 3–0 win over Derby County. However throughout the 2013–14 season, Treacy's first team was largely restricted to substitute appearances, due to strong competitions in Burnley’s midfield positions. He also faced sidelined, including a suspension following his sending off against West Ham United in the fourth round of the EFL Cup on 29 October 2013, as the club lost 2–0. Treacy's second goal later came on 15 February 2014, in a 1–1 draw against Bournemouth. His contributions helped Burnley promoted to the Premier League for the first time since 2009. At the end of the 2013–14 season, he went on to make thirty–one appearances and scoring once in all competitions.