The effects of freestream turbulence on the generation of crossflow disturbances in swept-wing boundary-layers are investigated through direct numerical simulations (DNS). The geometry and flow conditions correspond to those of experiments by [3] and [1]. In present study, we generate the isotropic homogenous freestream turbulence through DNS trying to match the characteristics of that measured in the experiments. The generated freestream fields are then applied as the inflow boundary condition for DNS of flow over the wing. Further, as in the experiments, a row of distributed roughness elements are placed near the leading edge to generate stationary crossflow disturbances. The effects of the generated freestream turbulence on the initial amplitudes of the boundary layer perturbations are then studied. Additionally their influences on the transition location are examined.