Arsenal came from two goals behind to draw 2-2 with Napoli in their opening match of the Emirates Cup.
Some poor first-half defending allowed Lorenzo Insigne and Goran Pandev to put the Italians in command.
However, an acrobatic goal by France striker Olivier Giroud with 18 minutes left sparked a fightback, with Laurent Koscielny heading in a dramatic late equaliser.
Wenger's side will face Galatasaray on Sunday afternoon, before a final pre-season friendly against Manchester City in Helsinki next weekend.