In the battle for the role of change-of-pace back for the Raiders, DeAndre Washington won’t have any more chances to prove himself worthy. He missed last Saturday’s game against the Rams with a knee injury that will require arthroscopic knee surgery that Jon Gruden expects will keep him out the last two games of the preseason.

“He had a minor scope on his knee,” Gruden said of Washington’s status. “He will not play against Green Bay. I don’t know that he’ll play against Seattle either, but he’s recovering quickly.”

Washington played well in the preseason opener against the Lions. In just nine snaps, he had 6 carries for 38 yards (6.1 yards per carry). That plus his camp — in which he missed a couple days for “personal reasons” — will have to stand. And, of course, he has put on tape his first two NFL seasons.

His main competition has been Jalen Richard, although if you think of it in terms of sheer number of backs, Chris Warren III has also made a case for one of those spots with his outstanding preseason. Washington being injured last week helped open the door for Warren to put up 110 yards and a touchdown on 18 carries.