Mancinelli joined Fortitudo Bologna in 2000, and he made his debut in the Italian League on April 14, 2001, against Viola Reggio Calabria.

During a friendly match between Canada and Italy on August 1, 2009, Mancinelli elbowed Canadian national team player Aaron Doornekamp in the back of the head.

Blindsided, Doornekamp was knocked to the ground and Mancinelli lurched towards him, sparking a bench clearing brawl between both teams.

A video of the incident shows that Italian players Andrea Bargnani and Marco Belinelli tried to break up the skirmish.

Doornekamp did not sustain any serious injuries and Italian team captain Matteo Soragna apologized after the game: "I am sorry that it happened.