Inter Milan defender Acerbi was cleared of racially insulting Napoli's Juan Jesus by a sporting judge last week.
Ravanelli told Pressing: "It is a very strange situation, I think there are no answers. It is strange that in a situation like this there wasn't a camera that recorded what they said to each other. And it seems strange to me that, when there was a confrontation with the referee, what happened and what they said to each other wasn't reported.
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"It seems that Acerbi told Juan Jesus that he plays in a team with another black boy, so it is as if he had admitted. So I believe that, rightly, everyone lost: only Acerbi's conscience knows if he has said and did something he shouldn't have done."