Allan is out of the Napoli squad to face Bologna, as he fractured two ribs during the Champions League draw with Liverpool.
It kicks off on Sunday at 17.00 GMT, click here for a match preview.
The Brazilian midfielder was one of the hardest hit by fines from the club for refusing to go back into a training retreat earlier this month.
A statement by Napoli today confirmed Allan will not be in the squad because he has fractured two ribs.
The incident occurred during the Champions League 1-1 draw with Liverpool at Anfield.
Also abset are injured Arkadiusz Milik, Arkadiusz Milik and Faouzi Ghoulam, but Lorenzo Insigne does return after an elbow injury
Napoli squad for Bologna: Callejon, Di Lorenzo, Elmas, Fabian Ruiz, Gaetano, Hysaj, Insigne, Karnezis, Koulibaly, Llorente, Lozano, Luperto, Manolas, Maksimovic, Mario Rui, Meret, Mertens, Ospina, Younes, Zielinski.
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