Victor Osimhen failed to add to his Serie A goals as champions Napoli lost 2-0 at Monza on Sunday.
Monza inflicted only the fourth Serie A defeat of the season on Napoli thanks to Dany Mota Carvalho and Andrea Petagna goals.
Osimhen still lead in the top scoring chart on 23 goals while Inter Milan striker Lautaro Martinez has 20 goals with three games left.