The current Italy manager, who will take over Chelsea after Euro 2016, is accused of sporting fraud.
The Calcioscommesse corruption probe says the 46-year-old former Juventus boss failed to expose an alleged rigged second division match in May 2011.
Juve honour on line at Chelsea for no-nonsense Conte
The game involved Siena, which Conte managed at that time, and AlbinoLeffe.
Conte denies any wrongdoing.
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