Arsenal's poor start to their Champions League campaign continue as Gunners suffered a home defeat from Olympiakos.
The home team got themselves ahead on 35 minutes from Felipe Pardo's effort, but was canceled out three minutes later by Theo Walcott.
However, the away team still finishing their first 45 minutes in front as they regained their lead on 40 minutes thanks to an own goal from David Ospina.
In the second half, Gunners' relentless attempts earned its reward as they equalized again through Alexis Sanchez's effort.
Unfortunately for Arsenal, one minute later, the Greek side got back in front, with a goal coming from Alredh FInnbogason.