FOXBORO (CBS) – Patriots offensive lineman Jonathan Cooper was carted off the field Saturday during the first day of padded training camp practices.

Cooper, who was acquired in a trade that sent Chandler Jones to the Arizona Cardinals, was playing with the first offensive unit when he appeared to injure his right foot.

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After being looked at by trainers, Cooper was placed onto a cart and brought from the practice field back into Gillette Stadium.

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The extent of his injury is not yet known.

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The former No. 7 overall draft pick has a history of injuries in his short NFL career. He has played in just 24 games since he was drafted in 2013, starting 11 games with the Cardinals.