A judge is expected to rule in January if Moggi, his son Alessandro and Italy coach Marcello Lippi's son Davide are guilty in the case along with three other men.
The 71-year-old Moggi, already banned from football for five years for his part in a 2006 match-fixing affair, is also facing a separate criminal trial in January over that scandal.
The six defendants, who deny the charges, have been accused of using threats and violence to make players sign for the management agency and sign for specific clubs so that Moggi's Juve side in the early part of the decade could prosper.
Juve were demoted to Italy's second divsion in 2006 when investigators ruled that then general manager Moggi was trying to pick favourable referees for their matches.
A host of famous witnesses have been called to give evidence at the Gea trial in recent months including Italy coach Lippi, Juve's French striker David Trezeguet and England coach Fabio Capello.
