The Curva Nord is the area behind the north goal in Rome's Olympic Stadium.
Lazio lost 4-0 to Juve on Sunday in a rout sparked by a goal from Paul Pogba, a French midfielder.
Spectators had been warned about racist chanting over the stadium loudspeaker during the game.
According to local media the chants were aimed at Pogba, Ghanaian midfielder Kwadwo Asamoah and defender Angelo Ogbonna.
Italian football has been plagued by racist discrimination and it shows no sign of being eradicated despite renewed efforts by the authorities.