[5][6] After the incident, Riccardo Colombo, Diana, Di Michele, Massimo Loviso, Marco Pisano, Francesco Pratali and Paolo Zanetti were transferred to other clubs, with only Rolando Bianchi, Angelo Ogbonna and Matteo Rubin remaining.

Diana joined AC Bellinzona in Switzerland on loan in early February 2010,[7] making his Super League debut on the 21st in a 2–1 away loss against FC Luzern, eventually contributing solidly (15 matches, 14 starts) as the club narrowly retained its division status.

After impressing Sampdoria, Diana received his first call-up to the Italy national team, making his debut in a friendly match with Spain on 28 April 2004.

On 2 June 2007, in his last appearance, Diana assisted on Filippo Inzaghi's second goal against the Faroe Islands, in a 2–1 away win for the UEFA Euro 2008 qualifying.

[11] In August 2016, he was hired new head coach of Pavia,[12] but resigned shortly thereafter, following the club's exclusion from Serie D due to financial issues.

[19] On 20 June 2024, Diana agreed to return to Feralpisalò, signing a two-year contract with the Serie C club, with Emanuele Filippini as his assistant.

[20] In 2016, Diana ran for office as a candidate for the city council of Flero, his town of residence, as part of a civic list backing the local Democratic Party mayor.