The England international struggled to contain Swansea winger Jefferson Montero as the Swans came from a goal behind to seal three points in the final 15 minutes.
The youngster has impressed producing some solid displays, but against Swansea he struggled and Keown feels Oxlade-Chamberlain should have provided more support for the youngster.
According to BBC Sport, he said:
Calum Chambers was not given much protection down the right by Alex Oxlade-Chamberlain and, too often on Sunday, Jefferson Montero was able to pick the ball up and do real damage.
It was almost as if Swansea were targeting Arsenal down that side because they could see that Chambers was struggling to deal with a right-footed left-winger.
He did not have the pace to deal with such a nippy player over the first five yards and, with Montero being right footed, the Swansea player was knocking it out of his feet and into space that Chambers was not expecting.I felt it was a big wake-up call for Chambers. Until now, everything has gone incredibly well for him over the last few months, with him flying from Southampton to Arsenal and into the England team.
Perhaps now, he realises what it is really all about to be a defender at this level.
It was a miserable day for the young lad, as he was off the pace from the first kick and his yellow card affected his decisions for the rest of the match. He was totally roasted all afternoon and the youngster didn’t know whether he was coming or going as Jefferson Montero subjected him to a torrid afternoon.
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He should not have been deployed at right-back, but Wenger just sat there and watched the lad suffer. Hopefully Chambers will get over this performance, but Wenger should seriously think about offering some protection to the youngster in defence.
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