The confrontation occurred after Fabregas pulled Alexis Saelemaekers' shirt, prompting Allegri to intervene. Referee Daniele Orsato showed the former Juventus coach a red card, while Fabregas escaped with a warning.
Allegri reportedly lashed out at Fabregas, calling him a "big idiot" and a "kid who started coaching yesterday." Fabregas later apologized for the unsportsmanlike gesture.