
Beretta, 48, returns on the bench where he had been substituted by Mandorlini despite managing last season to rescue the Tuscany side from relegation.
Cagliari are expected to follow suit as they lie joint last, albeit with a game in hand, next to Siena, Reggina, Livorno and Empoli on nine points from 12 games.
Veteran Nedo Sonetti is due back for the third time at the Sardinia side, replacing Marco Giampaolo, 40, who had been fired and called back during the previous season.
Livorno and Reggina have already changed coaches this season.
DPA