Leading Italian businessman Diego Dalle Valle, owner of the luxury goods firm Tod's and honorary president of Florence club Fiorentina, was also named on Friday along with his brother Andrea.
Juventus general manager Luciano Moggi and CEO Antonio Giraudo are at the centre of the scandal which was triggered by the publication of telephone taps of them discussing refereeing appointments with senior federation officials.
On Thursday, the board of directors of Juventus resigned en masse ahead of a shareholders' meeting on 29 June.
Turin magistrates have put Giraudo under investigation for possible false accounting relating to transfer dealings.
Magistrates in Rome are examining the operation of the GEA management company, which controls almost 200 players and coaches and is headed by Moggi's son Alessandro.
Juventus are strong favourites to win their 29th Italian title on Sunday's final day of the season, although the status of last season's win now depends on the outcome of the investigations. If Juventus were to be found guilty of "sporting fraud", they could be stripped of their title win and face demotion to the second tier Serie B. In the last major scandal to hit Italian football, AC Milan and Lazio were demoted to Serie B in 1980 following a match-fixing and illegal gambling investigation.
http://news.bbc.co.uk/sport1/hi/football/europe/4765173.stmAhh how ironic it had to be one of the few Italian clubs he werent in financial troubles that turn out to be so corrupted.