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 | 37 | 21 | 12 | 4 | 65 | 34 | 31 | 75 |
| 2 | Como | 37 | 21 | 9 | 7 | 57 | 39 | 18 | 72 |
| 3 | VeneziaVenezia | 37 | 21 | 7 | 9 | 68 | 44 | 24 | 70 |
| 4 | Cremonese | 37 | 18 | 10 | 9 | 47 | 32 | 15 | 64 |
| 5 | CatanzaroCatanzaro | 37 | 17 | 9 | 11 | 58 | 47 | 11 | 60 |
| 6 | Palermo | 37 | 14 | 11 | 12 | 61 | 53 | 8 | 53 |
| 7 | Sampdoria | 37 | 15 | 9 | 13 | 50 | 49 | 1 | 52 |
| 8 | Brescia | 37 | 12 | 15 | 10 | 44 | 38 | 6 | 51 |
| 9 | SudtirolSudtirol | 37 | 12 | 11 | 14 | 46 | 47 | -1 | 47 |
| 10 | Cosenza CalcioCosenza | 37 | 11 | 13 | 13 | 46 | 41 | 5 | 46 |
| 11 | Pisa | 37 | 11 | 13 | 13 | 50 | 52 | -2 | 46 |
| 12 | Cittadella | 37 | 11 | 13 | 13 | 40 | 44 | -4 | 46 |
| 13 | Reggiana | 37 | 10 | 16 | 11 | 37 | 44 | -7 | 46 |
| 14 | Modena | 37 | 9 | 17 | 11 | 38 | 45 | -7 | 44 |
| 15 | SpeziaSpezia | 37 | 8 | 17 | 12 | 34 | 48 | -14 | 41 |
| 16 | Ternana | 37 | 10 | 10 | 17 | 42 | 50 | -8 | 40 |
| 17 | AscoliAscoli | 37 | 8 | 14 | 15 | 36 | 41 | -5 | 38 |
| 18 | BariBari | 37 | 7 | 17 | 13 | 36 | 49 | -13 | 38 |
| 19 | FeralpiSaloFeralpiSalo | 37 | 8 | 9 | 20 | 44 | 64 | -20 | 33 |
| 20 | Lecco | 37 | 6 | 8 | 23 | 33 | 71 | -38 | 26 |
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