Oliver Giroud couldn't save Arsenal after being deployed from the bench by Arsene Wenger despite a deal being agreed with Chelsea before the match. Sam Clucas bagged a double for Swansea as the sorry Gunners left south Wales with nothing but grief from their travelling fans. Nacho Monreal opened the scoring on 33 minutes for Arsenal but it was all down hill from that point with Clucas finding the equaliser less than 60 seconds later. A Petr Cech howler led to Jordan Ayew slotting the second and Clucas blasted home the third late on. Henrikh Mkhitaryan made his debut off the bench after his move from Man United and could soon welcome former Dortmund team-mate Pierre-Emerick Aubameyang at the Emirates. Here are five talking points from a night to forget for the Gunners.