Manganites La0.93K0.07Mn1−x Cu x O3 prepared by the solid state reaction method at high temperature, were studied structurally and magnetically. The unit cell parameters, as well as bond length and the bond angle , were determined from the Rietveld refinement of the x-ray diffraction patterns. The Fourier-transform infrared spectroscopy analysis shows that Cu2+ substitution induces variations in the vibration modes of the MnO6 octahedra. Magnetization vs. temperature at low magnetic field were performed in the range under field coolingand zero field cooling conditions. All the samples exhibited a second-order paramagnetic–ferromagnetic (FM) transition at Curie temperature, , in the range between 199 and 285 K. The inverse susceptibility, exhibits a linear Curie-Weiss (C-W) behavior for , while for , it shows a deviation from the linear behavior predicted by the Heisenberg model. The mentioned deviation of means that a short ferromagnetic state formation is present even for , which were characterized by the experimental effective magnetic moment, A null spontaneous magnetization, above was evaluated for all samples by using the Kouvel-Fisher method. This work evaluates the short-range FM clusters by means of an extension of the C-W approach to the region, i.e., . Finally, the critical coefficient values, and , showed that the 3D Heisenberg model fits adequately the and samples, while the 3D Ising model fits the sample.