Arsenal may want to sign winger in the summer, and one of their reported targets just destroyed Barcelona to knock the La Liga Champions out of the Copa Del Rey. Barcelona, who have struggled in recent weeks, travelled to San Mames to face Athletic Club, where they encountered 21-year-old winger Nico Williams. Another former Arsenal target Jules Kounde was playing at right-back against the left-winger, but simply could not handle him as he tore Xavi’s side to shreds in a 4-2 victory after extra time. Mikel Arteta needs to add pace to his squad, and whilst Pedro Neto and Michael Olise have been…