Oakland Raiders quarterback Jason Campbell suffered a knee injury during the first half of Sunday's 17-9 loss to the San Francisco 49ers and will undergo an MRI exam on Monday, according to CSNBayArea.com.
Campbell was sacked twice in the game, but he was uncertain as to exactly when the injury occurred, according to the report.
Campbell completed 8 of 21 passes for 83 yards in place of injured starter Bruce Gradkowski.
The Associated Press contributed to this report.
