|Date of birth||April 30, 1972|
|Place of birth||Genoa, Italy|
|Height||1.76 m (5 ft 9 in)|
|Siena (youth coach)|
|1997||→ Castel di Sangro (loan)||12||(0)|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Mignani made his Serie A debut on 13 January 1991, against U.S. Lecce. He then went on to spend 10 seasons with Siena, being the team captain during the club's first Serie A campaign and one of the mainstays for the Tuscans. He left in 2006, and his #4 jersey number was retired by Siena as a homage.
He retired in 2009 to return to Siena as a youth coach, originally for the Allievi Nazionali and since 2010 for the main youth team, the Primaveraunder-19 squad.
- "UFFICIALE: Siena, è Mignani il nuovo tecnico della Primavera". TuttoMercatoWeb. 2010-05-23. Retrieved 2010-05-23.
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