Without Roethlisberger, the Steelers suffered the indignity of tying the winless Detroit Lions last Sunday in Pittsburgh, with Mason Rudolph filling in at quarterback. The Steelers have won four straight games with Roethlisberger in the lineup following a 1-3 start to the season. Roethlisberger didn’t practice all week while in isolation. He could get plenty of help from rookie tailback Najee Harris in this game, with the Chargers ranked last in the NFL in rush defense.