The 23-year-old has signed a four-year deal as he makes a return to his home country.
The forward left Internacional in 2007 to embark on a six-year spell in Italy.
Pato scored 51 goals in 117 appearances for Milan during an injury-plagued career at the San Siro.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Botafogo | 36 | 21 | 10 | 5 | 56 | 28 | 28 | 73 |
| 2 | PalmeirasPalmeiras | 36 | 21 | 7 | 8 | 58 | 31 | 27 | 70 |
| 3 | InternacionalInternacional | 35 | 18 | 11 | 6 | 51 | 29 | 22 | 65 |
| 4 | FortalezaFortaleza | 35 | 18 | 11 | 6 | 49 | 34 | 15 | 65 |
| 5 | FlamengoFlamengo | 35 | 18 | 9 | 8 | 53 | 38 | 15 | 63 |
| 6 | Sao Paulo | 35 | 17 | 8 | 10 | 50 | 37 | 13 | 59 |
| 7 | Cruzeiro | 34 | 13 | 8 | 13 | 39 | 37 | 2 | 47 |
| 8 | Bahia | 35 | 13 | 8 | 14 | 45 | 45 | 0 | 47 |
| 9 | Corinthians | 35 | 12 | 11 | 12 | 44 | 43 | 1 | 47 |
| 10 | Atletico Mineiro | 36 | 10 | 14 | 12 | 46 | 52 | -6 | 44 |
| 11 | Vasco da GamaVasco | 35 | 12 | 7 | 16 | 37 | 53 | -16 | 43 |
| 12 | Vitoria | 35 | 12 | 6 | 17 | 40 | 49 | -9 | 42 |
| 13 | JuventudeJuventude | 36 | 10 | 12 | 14 | 46 | 57 | -11 | 42 |
| 14 | Athletico ParanaenseAthletico PR | 35 | 11 | 8 | 16 | 38 | 42 | -4 | 41 |
| 15 | Gremio | 34 | 11 | 7 | 16 | 40 | 44 | -4 | 40 |
| 16 | Fluminense | 35 | 10 | 9 | 16 | 30 | 38 | -8 | 39 |
| 17 | CriciumaCriciuma | 35 | 9 | 11 | 15 | 39 | 49 | -10 | 38 |
| 18 | BragantinoBragantino | 35 | 8 | 13 | 14 | 36 | 45 | -9 | 37 |
| 19 | Cuiaba | 35 | 6 | 12 | 17 | 27 | 44 | -17 | 30 |
| 20 | Atletico GoianienseAtletico GO | 35 | 6 | 8 | 21 | 24 | 53 | -29 | 26 |
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