The 24-year-old centre-back rejoins the Flying Donkeys six months after leaving the club for AC Milan.
Genoa paid Chievo around £1.7m for 50% of Acerbi's registration rights in the summer of 2011, before the Rossoneri acquired the remaining 50% last summer.
Milan sold their half of Acerbi to Grifone in exchange for 50% of Kevin Constant just five days ago.
Acerbi will now be available for Sunday's visit of Juventus.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Pisa | 13 | 9 | 3 | 1 | 25 | 11 | 14 | 30 |
| 2 | SassuoloSassuolo | 13 | 8 | 4 | 1 | 25 | 12 | 13 | 28 |
| 3 | SpeziaSpezia | 13 | 7 | 6 | 0 | 19 | 8 | 11 | 27 |
| 4 | Cesena | 13 | 6 | 3 | 4 | 22 | 18 | 4 | 21 |
| 5 | Cremonese | 13 | 5 | 3 | 5 | 18 | 17 | 1 | 18 |
| 6 | BariBari | 13 | 3 | 8 | 2 | 15 | 11 | 4 | 17 |
| 7 | Palermo | 13 | 4 | 5 | 4 | 13 | 11 | 2 | 17 |
| 8 | Brescia | 13 | 5 | 2 | 6 | 18 | 20 | -2 | 17 |
| 9 | Juve StabiaJuve Stabia | 13 | 4 | 5 | 4 | 13 | 16 | -3 | 17 |
| 10 | Mantova | 13 | 4 | 4 | 5 | 12 | 15 | -3 | 16 |
| 11 | CatanzaroCatanzaro | 13 | 2 | 9 | 2 | 13 | 11 | 2 | 15 |
| 12 | Sampdoria | 13 | 4 | 3 | 6 | 16 | 18 | -2 | 15 |
| 13 | Cosenza CalcioCosenza | 13 | 4 | 6 | 3 | 13 | 13 | 0 | 14 |
| 14 | Modena | 13 | 3 | 5 | 5 | 18 | 19 | -1 | 14 |
| 15 | Reggiana | 13 | 3 | 5 | 5 | 13 | 15 | -2 | 14 |
| 16 | Carrarese | 13 | 3 | 4 | 6 | 11 | 15 | -4 | 13 |
| 17 | Salernitana | 13 | 3 | 4 | 6 | 13 | 18 | -5 | 13 |
| 18 | SudtirolSudtirol | 13 | 4 | 1 | 8 | 14 | 20 | -6 | 13 |
| 19 | Cittadella | 13 | 3 | 3 | 7 | 6 | 19 | -13 | 12 |
| 20 | FrosinoneFrosinone | 13 | 1 | 7 | 5 | 8 | 18 | -10 | 10 |
| > Serie B Full Table | |||||||||
