Cumani has also earned a reputation as a mentor to jockeys and assistant trainers. Frankie Dettori, Jimmy Fortune, Jason Weaver, Royston Ffrench and Nicky Mackay are all previous Champion Apprentices who learnt their trade under his tutelage. Leading rider Kieren Fallon was formerly employed by Cumani, as was rider Kirsty Milczarek. Christophe Clement, James Toller, Jonathan Portman, Chris Wall, John Berry, David Simcock and Marco Botti are the best known current trainers that spent a portion of their formative years as assistant trainer to Cumani.