 Treacy made his debut for the club in the opening game of the season, coming on as a substitute for Danny Rose in the 66th minute, in a 1–0 loss against Crawley Town.Unfortunately, Tracey's start to his Barnsley's career went bad after needing rehabilitation.Treacy then scored his first Barnsley goal on 22 November 2014, in a 2–1 loss against Chesterfield.