Diaby was loaned to F.C. Crotone for the second-half of the 2017–18 Serie A season. He made his professional debut on 14 April 2018 in a Serie A match against Genoa. He replaced Marcello Trotta after 84 minutes in a 1–0 away loss. He would make one further first team appearance for Crotone in their 1–1 draw against eventual champions Juventus on 18 April.