The Guinea International was the target of a slew of racist insults from the Italian crowd for 34 minutes of play, before rocketing the ball into the stands, then angrily storming off.
Referee Andrea Gervasoni subsequently ordered the stadium announcer to send a warning message to the crowd that the game would be suspended if any other incidents occurred.
Sassuolu eventually won the game 2-1, but the damage had already been done.
