Aalborg Boldspilklub
On 2 July 2018, free agent N'Doye returned to F.C. Copenhagen on a one-year deal. 27 days later, in a match against Aalborg Boldspilklub at Parken Stadium that finished 4–0, he scored a hat-trick in just 15 minutes to become the club's all-time topscorer, after surpassing César Santin. In January 2019, his contract was extended until the summer of 2020.