In July 2017, Sané said he believed his debut season at City had been limited by his inability to breathe through his nose. He said he particularly suffered during matches, with his constantly blocked nose hampering his performance and causing him intense frustration. He opted to have corrective surgery during the off-season break. Although this caused him to miss that year's FIFA Confederations Cup, he said his chronic nasal congestion was becoming increasingly unbearable for him and that he wished to enter the next season feeling happy and healthy.