Mikel Arteta believes Arsenal are own worst enemy despite win over Olympiacos

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Mikel Arteta saw Arsenal leave Olympiacos in charge of their Europa League tie following a good win – but admitted his side were once again their own worst enemy as a defensive error almost proved costly. The Gunners will defend a 3-1 lead at the Emirates Stadium next week and were good value for their round of 16 first leg win in Greece.