Alexandre Lacazette scored a late winner to secure Arsenal a 1-0 win at Olympiacos and hand the Gunners a significant advantage in their Europa League last-32 tie.
Mikel Arteta's men looked to be heading for an underwhelming goalless draw in Piraeus, but Lacazette struck nine minutes from time to get Arsenal a potentially vital away goal ahead of the return leg in London.
The Gunners had little difficulty taking control and should have netted early on when Lacazette was guilty of a dreadful miss, and the visitors failed to craft a better opportunity until late on.