HOUSTON—Pittsburgh defensive end Aaron Smith and running back Rashard Mendenhall have left the Steelers' game against Houston with injuries, joining injured linebacker James Harrison.
Smith injured his foot and was carted from the sideline to the locker room. Mendenhall scored on a 3-yard run in the third quarter. He didn't appear to be injured on the play, but was replaced by Isaac Redman on the next series.
The team says Smith's return is doubtful and Mendenhall's is questionable.
Harrison left Sunday's game with an an apparent eye injury in the second quarter. He was injured in a collision with a Houston player in the second quarter. He left the field after the play and television shots showed him shaking his head on the bench.
The team said his return was questionable.