“Yeah, it’s tough," head coach Bill O'Brien said. "I actually haven’t even seen him because we were waiting on a diagnosis. As soon as they diagnosed it they went and operated on it. I think it’s a tough thing. Devon, being a Penn State guy and what he’s gone through the past couple of years with his daughter, Leah, we feel for the guy.
"He did a good job for us while he was here and I’m sure he’ll come back from this and play more football in this league.”
Last week, the Texans placed star defensive end J.J. Watt on injured reserve with a back injury. He had surgery last week and will miss the rest of the season. Former No. 1 draft pick Jadeveon Clowney started in Watt's place at left defensive end and had the Texans' only sack of the game.
The Texans signed defensive end Antonio Smith last week to take Watt's roster spot. In his first game with the Texans since he signed, he played just 13 percent of the defensive snaps.
Still signed with the Texans during the offseason after three seasons with the Cincinnati Bengals. In three games this season, he had three combined tackles.
Houston signed defensive end Dan Pettinato to the practice squad to take Dunn's spot after he was signed to the active roster.