In situ reduction of tungstic acid and cobalt chloride by dextrose in silica gel resulted in co‐deposition of tungsten carbide‐cobalt (WC–Co) nanoparticles with different proportions of cobalt (5–15 wt % of WC). X‐ray powder diffraction (XRD), high‐resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and Fourier‐transform infrared (FT‐IR) spectroscopy have been used for characterizing these nanoparticles. WC‐Co aggregates of 25–30 nm size have been achieved, successfully.