Campbell beat the Chargers (6-5) earlier this season. This is a must-win type of game for the Raiders (5-6), who are two games out of first place in the AFC West. Gradkowski got the nod over Campbell last week, but Gradkowski sustained a shoulder injury that the Oakland Tribune reported Tuesday could keep him out the rest of the season.
Gradkowski had an MRI exam Monday that revealed a third-degree separation of his throwing shoulder, the Tribune reported, citing a source familiar with the situation.
Gradkowski re-injured the shoulder during Sunday's 33-17 loss to the Miami Dolphins. It was his first start since Oct. 10. He missed the rest of that game and the next four due to the same grade of ligament tears in the right shoulder.
After the Dolphins game, Gradkowski said this injury felt similar to his previous one which cost him the rest of the Oct. 10 game as well as the next four. Just five games remain in the regular season.