The 24-year-old had joined Freiburg from Grasshoppers last summer, but he was unable to help the club to stay in the Bundesliga.
He has become the Dortmund's third signing of the summer, following the recent arrivals of Gonzalo Castro and Julian Weigl.
Burki has won two caps for Switzerland, but he was forced to withdraw from their most recent squad through injury.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Bayern MunichBayern | 16 | 12 | 3 | 1 | 48 | 13 | 35 | 39 |
| 2 | Bayer LeverkusenB. Leverkusen | 16 | 10 | 5 | 1 | 40 | 23 | 17 | 35 |
| 3 | Eintracht FrankfurtFrankfurt | 16 | 9 | 3 | 4 | 36 | 23 | 13 | 30 |
| 4 | RB Leipzig | 16 | 9 | 3 | 4 | 28 | 22 | 6 | 30 |
| 5 | Mainz 05Mainz | 16 | 8 | 4 | 4 | 30 | 20 | 10 | 28 |
| 6 | Freiburg | 16 | 8 | 3 | 5 | 24 | 26 | -2 | 27 |
| 7 | Stuttgart | 16 | 7 | 5 | 4 | 30 | 25 | 5 | 26 |
| 8 | Borussia DortmundDortmund | 17 | 7 | 4 | 6 | 32 | 29 | 3 | 25 |
| 9 | Werder Bremen | 16 | 7 | 4 | 5 | 28 | 29 | -1 | 25 |
| 10 | Wolfsburg | 16 | 7 | 3 | 6 | 33 | 28 | 5 | 24 |
| 11 | Borussia MonchengladbachBorussia M'bach | 16 | 7 | 3 | 6 | 25 | 21 | 4 | 24 |
| 12 | Union BerlinUnion Berlin | 16 | 4 | 5 | 7 | 14 | 21 | -7 | 17 |
| 13 | Augsburg | 16 | 4 | 4 | 8 | 17 | 33 | -16 | 16 |
| 14 | St Pauli | 16 | 4 | 2 | 10 | 12 | 20 | -8 | 14 |
| 15 | Hoffenheim | 16 | 3 | 5 | 8 | 20 | 29 | -9 | 14 |
| 16 | Heidenheim | 16 | 4 | 1 | 11 | 20 | 33 | -13 | 13 |
| 17 | Holstein Kiel | 17 | 3 | 2 | 12 | 25 | 43 | -18 | 11 |
| 18 | VfL BochumVfL Bochum | 16 | 1 | 3 | 12 | 13 | 37 | -24 | 6 |
| > Bundesliga Full Table | |||||||||
