Possanzini started his career with the amateur team
Recanatese in 1992. He was signed by
Torino in 1994 but never made a first-team appearance and was later sold to
Serie C2 side
Lecco. He left Lecco after two seasons to join
Varese, another Serie C2 club, helping the
biancorossi to ensure promotion to Serie C1. Signed by
Serie B club
Reggina in September 1998, he immediately won a personal second promotion, scoring nine goals in his first season with the
amaranto. He made his
Serie A debut on 29 August 1999 in a 1–1 tie at
Juventus's home. In January 2001, after two and a half seasons with Reggina, he signed for
Serie B fallen giants
Sampdoria, but failed to make a breakthrough during his stay with the
blucerchiati. After an unimpressive season with
Catania in 2002–03, Possanzini was signed by Serie B minnows
AlbinoLeffe, where he quickly regained his best form and proved himself as a key player for his new club. In January 2005, Possanzini signed for
Palermo and returned to Serie A. Still, several injuries prevented him from being actively part of the Sicilian side; he eventually played only twice with the
rosanero before being sold again during the summer market, this time to
Brescia as partial compensation in the deal that brought
Andrea Caracciolo to Palermo. He is currently a mainstay for the
rondinelle and scored 24 goals in his first two seasons with Brescia, both in Serie B. In January 2009, Possanzini was banned for a year, along with
Daniele Mannini, by the
Court of Arbitration for Sport, at the request of the
World Anti-Doping Agency, for being late at the anti-doping controls after Brescia's game with
Chievo in December 2007. Both players were initially acquitted by the Italian Football Federation and successively condemned to a 15-day ban by
CONI. The ban was successively suspended by the Court of Arbitration for Sport itself later in March and cancelled on 27 July 2009 after being proved there was no real intention to avoid the controls from Possanzini and Mannini. ==Coaching career==