The 27-year-old tore an anterior ligament in his knee during Peru's 2-0 defeat to Ecuador in their 2014 World Cup qualifier in Quito on Tuesday.
Farfan is expected to be sidelined for a minimum of six weeks with the problem.
The news comes as Schalke captain Benedikt Hoewedes picked up a similar injury during Germany's 3-0 win over the Netherlands.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | SC PaderbornSC Paderborn | 13 | 6 | 6 | 1 | 22 | 16 | 6 | 24 |
| 2 | Karlsruher SCKarlsruher | 13 | 6 | 5 | 2 | 26 | 22 | 4 | 23 |
| 3 | Elversberg | 13 | 6 | 4 | 3 | 24 | 14 | 10 | 22 |
| 4 | Hannover | 13 | 7 | 1 | 5 | 17 | 12 | 5 | 22 |
| 5 | FC Koln | 13 | 6 | 3 | 4 | 25 | 20 | 5 | 21 |
| 6 | Magdeburg | 13 | 5 | 6 | 2 | 21 | 17 | 4 | 21 |
| 7 | Fortuna DusseldorfDusseldorf | 13 | 6 | 3 | 4 | 18 | 15 | 3 | 21 |
| 8 | Hamburger SV | 13 | 5 | 5 | 3 | 28 | 19 | 9 | 20 |
| 9 | KaiserslauternKaiserslautern | 13 | 5 | 5 | 3 | 23 | 20 | 3 | 20 |
| 10 | SV Darmstadt 98Darmstadt | 13 | 5 | 4 | 4 | 28 | 24 | 4 | 19 |
| 11 | Nuremberg | 13 | 5 | 3 | 5 | 26 | 23 | 3 | 18 |
| 12 | Hertha Berlin | 13 | 5 | 3 | 5 | 22 | 22 | 0 | 18 |
| 13 | Schalke 04Schalke | 13 | 3 | 4 | 6 | 23 | 26 | -3 | 13 |
| 14 | Greuther Furth | 13 | 3 | 4 | 6 | 20 | 26 | -6 | 13 |
| 15 | Eintracht BraunschweigBraunschweig | 13 | 3 | 3 | 7 | 16 | 27 | -11 | 12 |
| 16 | SSV UlmUlm | 13 | 2 | 5 | 6 | 12 | 15 | -3 | 11 |
| 17 | Preussen Munster | 13 | 2 | 5 | 6 | 15 | 20 | -5 | 11 |
| 18 | Jahn RegensburgJahn | 13 | 2 | 1 | 10 | 5 | 33 | -28 | 7 |
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