Serge Gnabry has given his verdict on facing Arsenal this week with Bayern Munich ahead of the winger’s return to north London. The Germany international was once on Arsenal’s books with Arsene Wenger signing Gnabry as a teenager, with the forward going on to make a handful of first-team appearances for the Gunners. Despite his potential, Gnabry was eventually sold by Arsenal in one of the most ill-informed deals the club have made in quite some time, with the 28-year-old now regarded as one of the best in the world. Bayern Munich star Serge Gnabry drops ‘difficult’ verdict ahead of Arsenal re…