Arsenal have claimed their first Champions League win of the season with a 2-1 victory against Olympiakos at the Emirates Stadium.
The Gunners went ahead on eight minutes when Alex Oxlade-Chamberlain fired in from inside the area.
Their lead was doubled 12 minutes later after Andre Santos's neat footwork allowed him to hit home from the angle.
The visitors got themselves back into the contest on 27 minutes when Torrijos David Fuster headed into the ground and past Wojciech Szczesny.
With only one goal separating the sides, the second half was a nervy affair for the hosts, but they managed to cling on for the three points.