Measurements of X-ray powder diffraction at room temperature, of electrical transport in the temperature range from 100 to 300 K, of magnetic susceptibility χin the range from 2 to 300 K and of magnetization M as a function of applied magnetic field H at a number of fixed temperatures were made on polycrystalline samples of Cu2FeGeSe4. The analysis of the X-ray diffraction lines show that Cu2FeGeSe4 has the tetragonal stannita structure with lattice parameter values of a = 5.60078 Å and c = 11.05609 Å. From the analysis of the electrical data, the values of the hole binding energy EA and the density of states effective mass of the holes mp are estimated. The resulting χvs. T data show that Cu2FeGeSe4is antiferromagnetic with a N�el temperature TN = 20 K and that a second transition occurs at ≈︂8 K indicating a transition to weak ferromagnetic state. The magnetization and susceptibility results obtained on Cu2FeGeSe4 show that at all temperatures below ≈︂70 K bound magnetic polarons (BMPs) occur, in the paramagnetic, antiferromagnetic and weak ferromagnetic ranges. The number of BMPs remained practically constant with temperature having a mean value of 6.55 × 1018 cm—3. Using a simple spherical model, this gives the radius of a BMP as 12.0 Å.