Arsenal hero Martin Keown has slammed the quality of Rio Ferdinand's defending at Manchester United.

Keown says Ferdinand lacks commitment when shots come in.

On West Bromwich Albion's winner on Saturday, Keown wrote in the Daily Mail: "United should have been able to deal with the threat, but Phil Jones was too deep, and Rio, who was caught out by the ball over the top, lacks commitment when blocking. It was a terrific strike by Saido Berahino, but it was another preventable goal."

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