Quarterback Bruce Gradkowski said Wednesday that he is confident he can recover from the third-degree separation of his right (throwing) shoulder in time to play again this season.
He said doctors told him his shoulder remains sound and won't require surgery. Raiders coach Tom Cable said team doctors told him Gradkowski is "one or two weeks away" from action.
"It seems like my shoulder's still strong to where if I just let it heal right, I'll be all right," Gradkowski said. "Just a couple of weeks, for sure, I'll be out. And other than that, I don't count the season out yet."
Gradkowski suffered the injury against the Miami Dolphins on Sunday when he was hit on his final pass of the game. He said the injury is comparable to the one that sidelined him for four games earlier this season.
Cable said Jason Campbell will start against the San Diego Chargers on Sunday. Kyle Boller is expected to be the No. 2.
Cable has said Gradkowski is the team's No. 1 quarterback when he's healthy. Gradkowski is hopeful he can reclaim his job at some point in the next five games.
"I'm not going to go down yet," Gradkowski said. "I'm just going to keep preparing, just keep rehabbing. But I'm thinking a couple of weeks and get back."
Schilens has been hampered by left foot and knee injuries since early in training camp. He missed the first 11 games and practiced only once before Wednesday.
Cable said he won't make a determination on whether Schilens can make his 2010 debut against the Chargers until he sees how Schilens holds up the rest of the week.