The 34-year-old, who spent 11 years with the club before joining St Pauli in 2010, was released by Greuther Furth earlier in the summer.
"We had a vacancy in the attack of our reserve team and Gerald could help us out there," Schalke's director of sport Horst Heldt told reporters at a press conference.
A number of German clubs had been linked with the midfielder this summer.
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 |
| > 2.Bundesliga Full Table | |||||||||
