After starting in each of the Bees' first seven league matches of the 2014–15 season, McCormack signed a new two-year contract, with the option of a third year. His status as an ever-present in league matches came to an end after he suffered an ankle ligament injury during a 3–1 defeat to Bolton Wanderers on 25 October 2014. He returned to light training in January 2015, but had lost the right back position to Moses Odubajo and made just four further appearances before the end of the 2014–15 season. McCormack made 18 appearances and scored one goal during the season.