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Mikel Arteta claims Arsenal must improve on their Europa League last-16 second-leg loss to Olympiakos despite it being enough to reach the quarter-finals of the competition... or the Gunners risk being knocked out in the later rounds

Mikel Arteta saw his Arsenal side reach the Europa League quarter-finals despite losing at home to 10-man Olympiakos before declaring they must improve in the next round or be knocked out.

The Gunners were beaten 1-0 at the Emirates Stadium as Youssef El-Arabi scored against Arsenal for the third game in a row.

Recalled skipper Pierre-Emerick Aubameyang missed a number of good chances to kill off the tie but a 3-1 win in Greece last week was enough to see Arteta's side through.

Mikel Arteta says Arsenal must improve from their 3-2 aggregate win over Olympiakos or be knocked out in the later rounds of the Europa League
The Gunners lost 1-0 at home via Youssef El-Arabi's goal but still progressed to the last-eight

But the Spaniard warned his players they would not be going any deeper into the competition if they do not improve on their latest Europa League performance.