Recent works have highlighted the potential of lignocellulosic biomass as an alternative source of material for value added products, and biorefineries represent a suitable replace for conventional fossil refineries as the conversion of biomass into biofuels and biomaterials are becoming a more feasible alternative for traditional fuels and oil-derivate materials . Within the many possibilities of use that enclosures agricultural biomass, the obtention of bioplastics has increased attention from the scientific community, the possibility of reinforcing for biopolymers such as PLA to enhance its natural physical or chemical properties has boosted awide series of researches. Among those who represent amost suitable option in elaborating biocomposites with this kind of plastics, are lignocellulosic materials, as they can be degraded or composted and present good behavior either as filler or as blend , the present study pretends to evaluate the performance of cellulose nanofibers and cellulose nanocrystals as fillers, either rough or after a surface modification with an hydrophobic additive.