In 2001, he was appointed by Serie C1 minnows AlbinoLeffe, a club founded a few years before following the merger of Leffe and Albinese, both teams previously coached by Gustinetti.
He joined newly promoted Serie B club Arezzo in 2005, leading the side to an impressive seventh place; this was followed by an unsuccessful campaign at Crotone, during which he was sacked in the half-season.
[7] His stint with the bianconeri club from Marche however lasted a mere few months, as Gustinetti was removed from his head coaching post on the 3rd of November due to poor results, with Ascoli being last-placed in the league.
[10] On 14 May 2013, Gustinetti was appointed at the helm of Lega Pro Prima Divisione fallen giants Lecce to replace Antonio Toma after he failed to win the league, ending the regular season in second place behind Trapani.
[11] He was hired only for the Serie B promotion playoffs, in which Lecce challenged and defeated Virtus Entella in a two-legged semifinal to ensure themselves a final against third-placed Carpi.