The 30-year-old Paraguayan joins the club on a free transfer after seeing his contract expire at the Stadio Renzo Barbera.
Barreto scored seven goals in 122 games during a four-season spell with Palermo.
"Now we can say: Edgar Osvaldo Barreto is officially a Sampdoria player," read a message on the club's official Facebook page.
Barreto has made 60 appearances for the Paraguay national team.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Parma | 33 | 20 | 9 | 4 | 59 | 32 | 27 | 69 |
| 2 | Como | 33 | 19 | 7 | 7 | 49 | 35 | 14 | 64 |
| 3 | VeneziaVenezia | 33 | 18 | 7 | 8 | 60 | 38 | 22 | 61 |
| 4 | Cremonese | 33 | 17 | 8 | 8 | 43 | 28 | 15 | 59 |
| 5 | CatanzaroCatanzaro | 33 | 16 | 7 | 10 | 53 | 42 | 11 | 55 |
| 6 | Palermo | 33 | 14 | 9 | 10 | 58 | 48 | 10 | 51 |
| 7 | Brescia | 33 | 11 | 12 | 10 | 38 | 35 | 3 | 45 |
| 8 | Sampdoria | 33 | 13 | 7 | 13 | 47 | 48 | -1 | 44 |
| 9 | Pisa | 33 | 11 | 10 | 12 | 44 | 45 | -1 | 43 |
| 10 | Cittadella | 33 | 11 | 10 | 12 | 37 | 40 | -3 | 43 |
| 11 | SudtirolSudtirol | 33 | 11 | 9 | 13 | 40 | 41 | -1 | 42 |
| 12 | Reggiana | 33 | 8 | 16 | 9 | 34 | 38 | -4 | 40 |
| 13 | Modena | 33 | 8 | 15 | 10 | 37 | 44 | -7 | 39 |
| 14 | Cosenza CalcioCosenza | 33 | 8 | 12 | 13 | 35 | 38 | -3 | 36 |
| 15 | Ternana | 33 | 9 | 9 | 15 | 38 | 45 | -7 | 36 |
| 16 | BariBari | 33 | 7 | 14 | 12 | 32 | 42 | -10 | 35 |
| 17 | SpeziaSpezia | 33 | 7 | 14 | 12 | 31 | 46 | -15 | 35 |
| 18 | AscoliAscoli | 33 | 7 | 12 | 14 | 33 | 38 | -5 | 33 |
| 19 | FeralpiSaloFeralpiSalo | 33 | 8 | 7 | 18 | 38 | 54 | -16 | 31 |
| 20 | Lecco | 33 | 6 | 8 | 19 | 31 | 60 | -29 | 26 |
| > Serie B Full Table | |||||||||
