David Luiz will learn from the mistakes he has made early in his Arsenal career, according to Per Mertesacker.
The defender has struggled since signing from Chelsea, making high-profile errors in Premier League games against Liverpool and north London rivals Tottenham.
Arsenal are fifth into the table ahead of Sunday's trip to Watford and Gunners academy manager Mertesacker feels the Brazilian will bounce back.
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"I think he will learn from his mistakes on the pitch, but he is very comfortable being at Arsenal," former Germany centre-back Mertesacker told Sky Sports.