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ALAMEDA, Calif. (AP) - Oakland Raiders rookie quarterback Derek Carr avoided a serious rib injury from a hard hit that knocked him out of an exhibition game against the Detroit Lions.

Coach Dennis Allen said Saturday that X-rays on Carr's ribs were negative. Carr also suffered a concussion on the hard hit by Larry Webster on Friday night and must pass the league protocols before he is able to return to practice this week.

Carr played well in his second pro game, completing 9 of 16 passes for 109 yards and a touchdown. He even got one series with the first-team offense, but Allen says Matt Schaub will get most of the time with the starters in the dress rehearsal game at Green Bay on Friday.

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