The 2017–18 season was an excellent one for Coman. Coman had played 32 matches, scored seven goals and provided another eight assists throughout all competitions until late February, when Coman suffered an ankle injury against Hertha Berlin on 24 February 2018. Coman suffered a partial tear of ligaments in his left ankle. The injury required a surgery that was performed several days later. On 19 May 2018, Coman returned from the ankle injury in the DFB-Pokal Final in Berlin in a loss against Eintracht Frankfurt. Coman came on as a substitute in the 70th minute.