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Jason Campbell takes concussion test

Jason Campbell

Oakland Raiders quarterback Jason Campbell (8) walks off the field after being tackled by San Francisco 49ers defensive tackle Justin Smith (94) and linebacker Ahmad Brooks (55) in the second quarter of a preseason NFL football game in San Francisco, Saturday, Aug. 20, 2011. (AP Photo/Ben Margot)

AP

When we last left Raiders quarterback Jason Campbell on Saturday night, he left Oakland’s game against the 49ers with an undisclosed injury.

Campbell clarified after the game he took a knee to the helmet. He underwent concussion tests. Coach Hue Jackson used the age-old phrase “dinged up” to describe Campbell.

Oakland’s offense looked pretty bad all night. Trent Edwards replaced Campbell and was ineffective. Kyle Boller, also competing for the backup quarterback job, wasn’t really any better.

The Raiders rushing game has struggled without Darren McFadden, averaging 3.36 yards-per-carry.