ALAMEDA, Calif. (AP) -Oakland Raiders left tackle Kwame Harris is doubtful for Sunday's game at Kansas City with a knee injury, possibly forcing Mario Henderson to make his first career start in the difficult environment of Arrowhead Stadium.
Harris left Monday night's game with the injury and has been unable to practice all week. Harris will work out Saturday morning to see if his knee is healthy enough to play Sunday against the Chiefs.
``He just can't really push off it right now,'' coach Lane Kiffin said Friday. ``He came out yesterday and tried a little bit, he thought it was getting better, just not a lot of strength in it right now.''
Henderson, a third-round pick last season, was active for only one game last season and only appeared briefly on special teams. Henderson was inactive last week.
In other injury news, receiver Javon Walker still has some pain in his injured hamstring but will play Sunday. Kiffin said he has not decided whether to start Walker or Ashley Lelie at split end. Walker missed the opener with the injury.

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