Woven fabric composites with thermoplastic matrices enable superior mechanical properties which are limited by the matrix rich areas due to the undulated network of yarns. A novel in situ melt impregnation process facilitates the use of thermoplastic compounds with short glass (sGF) and carbon fibres (sCF) for the impregnation of fabrics creating a new class of woven fabric composites. The presented composites consist of a Polyamide 6 matrix with a constant fabric volume fraction of 43 % and short fibre volume contents up to 7.8 %. These additional short fibres aiming for the occupation of matrix rich areas significantly increase the mechanical properties. Only 3.6 vol% sCF led to an enhancement by 37 % in compression modulus and 52 % in shear modulus in direction of the short fibres compared to unmodified woven fabric composites. Even perpendicular to the short fibre orientation an increase in compression and shear modulus was observed.