The invention relates to a method for producing thermoplastic fibre composites made from a thermoplastic matrix (M) comprising a thermoplastic moulding compound (A) and reinforcing fibres (B). Said method has technical advantages when it comprises the following steps: i) a flat structure (F) made of reinforcing fibres (B) is provided, ii) the flat structure (F) is introduced into a matrix M, iii) functional groups of the matrix are reacted with polar groups of the reinforcing fibres (B), iv) the fibre composite materials is consolidated.