Juventus facing ban after fans racially abused Kevin Boateng
Bianconeri fans made monkey noises aimed towards midfielder Kevin-Prince Boateng in the warm-up.
Boateng heard them and reacted, putting his finger to his lips to shut them up.
A message was read over the public-address system warning the hooligans to stop.
This was after Juve's ultras group Drughi released a statement urging their members not to use racist insults.
If Juventus are found guilty, their next home match against Palermo will be played behind closed doors.