Martín Gastón Demichelis (born 20 December 1980) is an Argentine professional footballer who plays usually as a central defender for Spanish club RCD Espanyol, although he can also operate as a defensive midfielder. Demichelis spent most of his professional career with Bayern Munich in Germany (seven and a half years), winning 11 major titles with the team. He also competed in his home country with River Plate, in Spain with Málaga and in England with Manchester City.