 McCormack scored his first Brentford goal in an FA Cup first round tie against local neighbours Staines Town on 9 November, opening the scoring with a penalty in a 5–0 victory.A near ever-present under Uwe Rösler and his successor Mark Warburton, McCormack celebrated promotion to the Championship after a 1–0 victory over former club Preston North End on 18 April 2014.He finished the 2013–14 season with 45 appearances and two goals.