Napoli have announced their squad to face Red Bull Salzburg in the Champions League tomorrow, which includes Allan and Elseid Hysaj.
Allan missed Napoli's 2-1 defeat to Roma at the weekend with a knee injury, but the midfielder is back despite only training lightly on Monday.
There is also a return for Hysaj, but Faouzi Ghoulam and Amin Younes remains unavailable and Amin Younes is discarded.
A win for Ancelotti's side could guarantee qualification for the Round of 16 - a stage they haven't reached since 2016-17.
Napoli squad to face Salzburg: Meret, Ospina, Karnezis; Di Lorenzo, Koulibaly, Manolas, Hysaj, Luperto, Maksimovic, Mario Rui; Allan, Gaetano, Callejon, Zielinski, Fabian, Elmas; Mertens, Milik, Llorente, Lozano, Insigne