The 30-year-old, who spent last season on loan at Bolton Wanderers, was signed by Steve McClaren for £4.5m from Stoke City just 18 months ago.
Tuncay made just five appearances during his time in Germany without scoring a goal.
The striker only found the net once for the Trotters, in a Carling Cup game against Macclesfield.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Bayern MunichBayern | 11 | 9 | 2 | 0 | 36 | 7 | 29 | 29 |
| 2 | RB Leipzig | 10 | 6 | 3 | 1 | 15 | 5 | 10 | 21 |
| 3 | Eintracht FrankfurtFrankfurt | 10 | 6 | 2 | 2 | 26 | 16 | 10 | 20 |
| 4 | Bayer LeverkusenB. Leverkusen | 10 | 4 | 5 | 1 | 21 | 16 | 5 | 17 |
| 5 | Freiburg | 10 | 5 | 2 | 3 | 13 | 11 | 2 | 17 |
| 6 | Union BerlinUnion Berlin | 10 | 4 | 4 | 2 | 9 | 8 | 1 | 16 |
| 7 | Borussia DortmundDortmund | 10 | 5 | 1 | 4 | 18 | 18 | 0 | 16 |
| 8 | Werder Bremen | 10 | 4 | 3 | 3 | 17 | 21 | -4 | 15 |
| 9 | Borussia MonchengladbachBorussia M'bach | 10 | 4 | 2 | 4 | 15 | 14 | 1 | 14 |
| 10 | Mainz 05Mainz | 10 | 3 | 4 | 3 | 15 | 14 | 1 | 13 |
| 11 | Stuttgart | 10 | 3 | 4 | 3 | 19 | 19 | 0 | 13 |
| 12 | Wolfsburg | 10 | 3 | 3 | 4 | 19 | 18 | 1 | 12 |
| 13 | Augsburg | 11 | 3 | 3 | 5 | 13 | 23 | -10 | 12 |
| 14 | Heidenheim | 10 | 3 | 1 | 6 | 13 | 15 | -2 | 10 |
| 15 | Hoffenheim | 10 | 2 | 3 | 5 | 13 | 19 | -6 | 9 |
| 16 | St Pauli | 10 | 2 | 2 | 6 | 7 | 12 | -5 | 8 |
| 17 | Holstein Kiel | 10 | 1 | 2 | 7 | 12 | 25 | -13 | 5 |
| 18 | VfL BochumVfL Bochum | 10 | 0 | 2 | 8 | 10 | 30 | -20 | 2 |
| > Bundesliga Full Table | |||||||||
