Modest: Per Mertesacker reveals the key to Arsenal’s success v Olympiakos (video)

Arsenal defender Per Mertesacker has said that the Gunners’ outstanding victory against Olympiakos was down to how well his side defended.

The German defender formed a formidable partnership with Laurent Koscielny during the ninety minutes in Athens on Wednesday night, with the Frenchman taking most of the plaudits for Arsenal’s superb defensive display.

Despite a hat-trick from striker Olivier Giroud, Mertesacker believes the key to his side’s success last night, was the strength of the defence.

Listen to the German defender’s thoughts on the victory below.