Juventus assistant coach Marco Landucci launched a stunning verbal attack on Napoli coach Luciano Spalletti after defeat on Sunday.
Juve were on the wrong side of several refereeing decisions, which infuriated the home bench.
At the final whistle, Calcio e Finanza reports Landucci turned on Spalletti, shouting: "Bald fool! I'll eat your heart!"
That's according to multiple witnesses of the encounter. Landucci has now been fined and banned one game for his behaviour.
Asked about the report today, Juve coach Max Allegri said: "We have to think about working on the pitch, continue to behave as we did for what happens off the pitch.
"Complaints lead nowhere. We have hardly ever complained, it's part of my way of thinking. We have to continue like this because we mustn't waste energy, complaints don't bring points and we must accept what happens for better or for worse.
"We must be angry because we left a point on the pitch, the goal is our responsibility."