Arsenal boss Arsene Wenger admits he was disappointed with Wojciech Szczesny's actions after being sent off against Bayern Munich.
Wenger admitted the goalkeeper was unprofessional in making an obscene gesture following his red card.
He remarked: "It was frustration but we are professionals, me included, and we have always to master reactions. Wojciech is part of that as well. We'll deal with that internally. We don't agree with that."
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