Monreal arrived from Malaga and has fitted in instantly, becoming a useful squad member at left back.
“The first thing you want from your defenders is to defend well, so we cannot reproach him for that. You will see the other aspects of his game more when his confidence has settled,” Wenger told the official Arsenal magazine.
“He is good in the air for a guy of his size, has a quick leap and has looked good.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.