The Spaniard picked up the injury during a Paulaner Cup encounter last night.
It is expected that Reina will now undergo a scan, but Bayern do not expect the stopper to return to action until December at the earliest.
The 32-year-old joined Bayern from Liverpool on a three-year deal during the summer.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Bayern MunichBayern | 25 | 19 | 4 | 2 | 74 | 23 | 51 | 61 |
| 2 | Bayer LeverkusenB. Leverkusen | 25 | 15 | 8 | 2 | 55 | 30 | 25 | 53 |
| 3 | Mainz 05Mainz | 25 | 13 | 5 | 7 | 42 | 26 | 16 | 44 |
| 4 | Eintracht FrankfurtFrankfurt | 25 | 12 | 6 | 7 | 51 | 39 | 12 | 42 |
| 5 | Freiburg | 25 | 12 | 5 | 8 | 34 | 36 | -2 | 41 |
| 6 | RB Leipzig | 25 | 10 | 9 | 6 | 39 | 33 | 6 | 39 |
| 7 | Wolfsburg | 25 | 10 | 8 | 7 | 49 | 39 | 10 | 38 |
| 8 | Stuttgart | 25 | 10 | 7 | 8 | 44 | 39 | 5 | 37 |
| 9 | Borussia MonchengladbachBorussia M'bach | 25 | 11 | 4 | 10 | 39 | 38 | 1 | 37 |
| 10 | Borussia DortmundDortmund | 25 | 10 | 5 | 10 | 45 | 39 | 6 | 35 |
| 11 | Augsburg | 25 | 9 | 8 | 8 | 28 | 35 | -7 | 35 |
| 12 | Werder Bremen | 25 | 9 | 6 | 10 | 38 | 49 | -11 | 33 |
| 13 | Union BerlinUnion Berlin | 25 | 7 | 6 | 12 | 23 | 37 | -14 | 27 |
| 14 | Hoffenheim | 25 | 6 | 8 | 11 | 32 | 47 | -15 | 26 |
| 15 | St Pauli | 25 | 6 | 4 | 15 | 19 | 30 | -11 | 22 |
| 16 | VfL BochumVfL Bochum | 25 | 4 | 6 | 15 | 25 | 50 | -25 | 18 |
| 17 | Holstein Kiel | 25 | 4 | 5 | 16 | 37 | 61 | -24 | 17 |
| 18 | Heidenheim | 25 | 4 | 4 | 17 | 28 | 51 | -23 | 16 |
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