Arsenal slipped to a 2-1 defeat to Eintracht Frankfurt in the UEFA Europa League on Thursday at the Emirates Stadium.
Granit Xhaka made his first appearance for Arsenal since being stripped of the captaincy after being booed by Gunners supporters while being substituted in a home draw against Crystal Palace in October.
Unai Emery's side took the lead in stoppage time at the end of the first half when Pierre-Emerick Aubameyang swept in a shot that flew up onto the underside of the crossbar and bounced over the line.
Frankfurt hit back in the second half through two goals in nine minutes from Daichi Kamada.