Moss was hurt while going up for a deep pass from Oakland quarterback Kerry Collins late in the first quarter and getting sandwiched between Chargers defensive backs Sammy Davis and Terrence Kiel. Moss landed hard on the McAfee Coliseum turf and lay prone for several moments before finally being helped to his feet and off the field by team trainers.
Moss did make one attempt to go back in the game but returned to the sidelines and was eventually taken into the locker room for X-rays.
On Monday Moss underwent an MRI test which revealed the extent of his litany of injuries.
''He's very sore today,'' Raiders coach Norv Turner said. ''We'll see how quickly the soreness leaves. With our doctors and with (trainer Rod Martin) and the thing right now is he will lay down and get off his feet and rest.''
Turner said a decision regarding Moss' availability for Sunday's game against Buffalo wouldn't be made until Wednesday at the earliest.
''I wouldn't speculate on that right now,'' Turner said. ''I wouldn't even start to talk about it until late in the week and we'll see where he's at.''
Moss did not catch a pass for the first time this season and is just third on the team in receptions with 19. His presence in the Oakland lineup was expected to be a boost for the offense as well as quarterback Kerry Collins but neither has proven out.
More critical to the offense, according to Turner, has been the Raiders' inability to run the ball with sustained success.
''Any team that loses one of their best players, it's going to have an effect, but certainly I'm not going to sit in here and say that that was the issue in terms of why we didn't move the football,'' Turner said. ''We had opportunities. We had breakdowns that kept us from moving the football.
''The biggest thing is getting some continuity, getting some consistency in the running game. When that happens it certainly helps the quarterback a great deal, it certainly helps the passing game a great deal. I think that was very true in the Dallas game. Sometimes there are extenuating circumstances in terms of the reasons why you were able or weren't able to get the run going. Unfortunately the way this game started, we had very few plays in the first quarter. We had a three-and-out inside our 10 and then throw an interception on a one-play drive. That limits the opportunities. Next thing it's 14-0 and the game changes a little bit that early. It doesn't have to change a lot. But the overriding thing is us getting consistency in the running game. I think that will help everything else.''
* Defensive end DeLawrence Grant has a sprained ankle and was listed on the Raiders' injury report Monday. Turner did not know the extent of Grant's injury or if it would keep him from practicing this week.
* Center Jake Grove ran at the team's practice facilities Monday, which could mean he'll be back in the starting lineup against Buffalo.