The 25-year-old, who has a release clause in the region of £7m, joined Mainz from Real Madrid in 2010.
His performances have not gone unnoticed in Germany, however, with a number of sides believed to be interested in securing his services.
The forward will became Schalke's third signing of the summer transfer window.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | FC Koln | 17 | 9 | 4 | 4 | 32 | 23 | 9 | 31 |
| 2 | Karlsruher SCKarlsruher | 17 | 8 | 5 | 4 | 34 | 31 | 3 | 29 |
| 3 | Hamburger SV | 17 | 7 | 7 | 3 | 39 | 23 | 16 | 28 |
| 4 | Elversberg | 17 | 8 | 4 | 5 | 31 | 22 | 9 | 28 |
| 5 | Magdeburg | 17 | 7 | 7 | 3 | 30 | 24 | 6 | 28 |
| 6 | SC PaderbornSC Paderborn | 17 | 7 | 7 | 3 | 29 | 24 | 5 | 28 |
| 7 | Hannover | 17 | 8 | 3 | 6 | 22 | 17 | 5 | 27 |
| 8 | Fortuna DusseldorfDusseldorf | 17 | 7 | 5 | 5 | 28 | 23 | 5 | 26 |
| 9 | KaiserslauternKaiserslautern | 17 | 7 | 5 | 5 | 30 | 27 | 3 | 26 |
| 10 | SV Darmstadt 98Darmstadt | 17 | 6 | 6 | 5 | 36 | 29 | 7 | 24 |
| 11 | Nuremberg | 17 | 6 | 4 | 7 | 31 | 30 | 1 | 22 |
| 12 | Hertha Berlin | 17 | 6 | 4 | 7 | 27 | 27 | 0 | 22 |
| 13 | Schalke 04Schalke | 17 | 5 | 5 | 7 | 32 | 33 | -1 | 20 |
| 14 | Greuther Furth | 17 | 5 | 5 | 7 | 24 | 33 | -9 | 20 |
| 15 | Preussen Munster | 17 | 3 | 7 | 7 | 18 | 23 | -5 | 16 |
| 16 | SSV UlmUlm | 17 | 2 | 8 | 7 | 16 | 20 | -4 | 14 |
| 17 | Eintracht BraunschweigBraunschweig | 17 | 3 | 4 | 10 | 16 | 36 | -20 | 13 |
| 18 | Jahn RegensburgJahn | 17 | 3 | 2 | 12 | 9 | 39 | -30 | 11 |
| > 2.Bundesliga Full Table | |||||||||
