Chambers has shone since his summer arrival from Southampton.
"It is a strange one because I would imagine that to be very successful at 19 you need to be massively confident, maybe overconfident at times," the goalkeeper told Arsenal Player.
"But Calum isn't - he's very humble, very quiet and he shows his confidence on the pitch. It is a massive quality because he looks very comfortable, whether you play him at right back or centre back.
"He is comfortable on the ball, he is comfortable defending and he is very strong as well. He has been a massive signing.
"The pressure was on him as well because he was 19, he came to a big club and he went straight into the starting XI but he has been coping very well."
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