Personal terms have already been agreed between the player and Milan with Bonucci ready to sign a €6million-a-year deal.
Bonucci had a falling out with manager Maxi Allegri last season, and it's apparently serious enough for the centre-back to force a move to Milan.
According to the Guardian, Bonucci will put pen to paper on a deal with Milan before the end of the weekend.
Bonucci has also featured in two Champions League finals for the Italian giants.
Bonucci has been superb for club and country in the last five years and is at the peak of his powers at 30 years old.
For Tacchinardi, Bonucci's move does not necessarily guarantee the Scudetto for Milan, but the 41-year-old admitted he was disappointed to see a symbolic figure depart for a rival.
Milan have already splurged close to €100m on signings so far in the transfer window as they aim to get back amongst the European Elite.
Speaking to RadioVS earlier, Goal Italia journalist Romeo Agresti confirmed that the player is leaving Juventus, in part due to a falling out with Max Allegri.
Since then, City have spent £50m on John Stones, while Chelsea have splashed £32m on bringing Antonio Rudiger from Roma.