Alexis Sanchez seals Arsenal 's progress to Arsenal group stages . It is 16 years Arsenal have made the group stages of the competition . Sanchez 's first goal for the club sees off Besiktas club Besiktas in their playoff tie . Wenger also confirmed striker Olivier Giroud would be missing until at least December after undergoing surgery on an ankle injury , and said he would dip into the transfer market if he could find a forward of suitable quality . Germany 's Europe knock out Napoli ; Germany 's Bayer Leverkusen also through .
Alexis Sanchez seals Arsenal 's progress to Arsenal group stages . It is 16 years Arsenal have made the group stages of the competition . Sanchez 's first goal for the club sees off Besiktas club Besiktas in their playoff tie . Germany 's Europe knock out Napoli ; Germany 's Bayer Leverkusen also through .