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AC Milan bolstered their chances of finishing in the Champions League places in Serie A with a 2-0 win at home to relegated Frosinone on Sunday.
A Hakan Calhanoglu goal gave AC Milan a 1-0 win at mid-table Fiorentina in Serie A on Saturday to keep them in the hunt for a Champions League spot.
AC Milan revived their Champions League hopes with a 2-1 win over Bologna on Monday in a match featuring an angry sideline row.
AC Milan manager Gennaro Gattuso said his players were on a training ground lockdown because there are "rules" which need to be followed.
AC Milan's players will spend the next five days sequestered at the training centre after Gennaro Gattuso ordered a ritiro.
Lazio have been handed a suspended sentence of a one-match partial stadium ban after their fans racially abused AC Milan players on Wednesday.
AC Milan's hopes of qualifying for next season's Champions League suffered a setback after they were beaten 2-0 by Torino on Sunday.
Lazio have distanced themselves from racist chanting from certain sections of their fans, but did not condemn the deplorable scenes on Wednesday.
Lazio reached the Coppa Italia final when a breakaway goal from Joaquin Correa gave them a 1-0 win away to AC Milan in their semifinal second leg.
AC Milan were held to a 1-1 draw at Parma in Serie A on Saturday after veteran defender Bruno Alves scored with a majestic free kick late on.
Lega Serie A have told ESPN FC they "strongly condemn" recent episodes of racism that have blighted Italian football.
AC Milan strengthened their grip on fourth place in Serie A with a tense 1-0 win over Lazio at San Siro on Saturday that ended with a scuffle.
AC Milan's hopes of qualifying for the Champions League have been thrown into doubt after breaching FFP regulations for a second successive term.