Arsenal secured a vital win contest of a Alexandre Lacazette goal as they beat Olympiakos in the last-32 tie in the Europa League.
With the match heading to a goalless draw after both sides could not size each others up.
Alexandre Lacazette steal the show in the 81st minutes after scoring from close range following a low cross from Bukayo Saka.
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The French man had earlier missed with a shot from eight yards.
Arsenal number one shot stopper Bernd Leno produce a good save to stop Youssef El-Arabi from scoring.
Arsenal will host Olympiakos for the return leg which will take place at the Emirates Stadium on Thursday, 27 February.