FIA president Jean Todt and former Formula 1 CEO Bernie Ecclestone are among a number of high-profile names questioned as part of a probe into the finances surrounding the Italian GP.
The race at the historic Monza circuit has been under threat in recent years with deals done to secure the short-term future of one of the sport's biggest events.
However, a report in Italy says an investigation has been underway since 2012 with upto 82 race insiders involved.
The allegations include money laundering through tax evasion by creating false invoices relating to driver sponsorship deals with Todt implicated in one such contract by overstating the money given to then-Marussia driver Jules Bianchi.
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Ecclestone and Todt's son Nicolas, who manages several drivers including Charles Leclerc, have been questioned by authorities according to La Repubblica.
Those investigating are also concerned other Grands Prix around Europe could be or have been involved in similar schemes over the same time period.
