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 | Fortuna DusseldorfDusseldorf | 4 | 3 | 1 | 0 | 5 | 1 | 4 | 10 |
| 2 | Karlsruher SCKarlsruher | 4 | 3 | 1 | 0 | 8 | 5 | 3 | 10 |
| 3 | Greuther Furth | 4 | 2 | 2 | 0 | 10 | 4 | 6 | 8 |
| 4 | Magdeburg | 4 | 2 | 2 | 0 | 9 | 3 | 6 | 8 |
| 5 | SC PaderbornSC Paderborn | 4 | 2 | 2 | 0 | 6 | 3 | 3 | 8 |
| 6 | FC Koln | 4 | 2 | 1 | 1 | 11 | 5 | 6 | 7 |
| 7 | Hamburger SV | 4 | 2 | 1 | 1 | 7 | 4 | 3 | 7 |
| 8 | Hertha Berlin | 4 | 2 | 1 | 1 | 8 | 6 | 2 | 7 |
| 9 | Hannover | 4 | 2 | 1 | 1 | 3 | 1 | 2 | 7 |
| 10 | KaiserslauternKaiserslautern | 4 | 2 | 1 | 1 | 8 | 7 | 1 | 7 |
| 11 | Elversberg | 4 | 1 | 2 | 1 | 8 | 5 | 3 | 5 |
| 12 | Schalke 04Schalke | 4 | 1 | 1 | 2 | 9 | 9 | 0 | 4 |
| 13 | Nuremberg | 4 | 1 | 1 | 2 | 6 | 9 | -3 | 4 |
| 14 | Jahn RegensburgJahn | 4 | 1 | 0 | 3 | 1 | 8 | -7 | 3 |
| 15 | SSV UlmUlm | 4 | 0 | 1 | 3 | 2 | 5 | -3 | 1 |
| 16 | Preussen Munster | 4 | 0 | 1 | 3 | 2 | 8 | -6 | 1 |
| 17 | SV Darmstadt 98Darmstadt | 4 | 0 | 1 | 3 | 2 | 10 | -8 | 1 |
| 18 | Eintracht BraunschweigBraunschweig | 4 | 0 | 0 | 4 | 3 | 15 | -12 | 0 |
| > 2.Bundesliga Full Table | |||||||||
