 On 3 November, Hooper scored his first European goal of the season, netting the final goal of Celtic's 3–1 Europa League group stage win against Rennes, after coming on as a 78th-minute substitute for James Forrest.Three days later, he again came on as a substitute and scored the winner in a 2–1 win over Motherwell.On 26 November, he scored a hat-trick in a 5–0 win over St Mirren.