ARSENAL'S biggest weakness is defending set-pieces, according to Olympiacos boss Pedro Martins.
The Greek side knocked the Gunners out of the Europa League last month and the Portuguese has revealed how his side exploited a weakness.
Both Olympiacos goals – from Pape Abou Cisse and Youssef Al-Arabi – in the second leg at the Emirates came from set-pieces and earned the Greeks a 2-1 win on the night to go through on away goals.
Martins told the Athletic: "Set pieces are always important.
"In this kind of match, you must be efficient when you have a chance.
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