Green Bay defenders have pulled in 17 interceptions, tied for the third-highest total in the league.
If Schaub, back in the huddle after four games recovering from a knee injury, can't protect the ball at Lambeau Field, the Texans will have trouble getting a third straight win.
"Damn right that scares me, we have to protect the ball," coach Gary Kubiak told Houston reporters Wednesday. "We threw a couple today in practice. We can't throw them. They're excellent, they have great ball skills. You got [Charles] Woodson, the guy outside, [Al] Harris outside. I mean, they're a man-coverage team. They lock you down. You have to beat man-coverage. You make a mistake with the ball and they make you pay. That's what good corners do and they've got them. Their safeties have done a hell of a job, too."
Safety Nick Collins is also a big threat. He's tied with Woodson for a team-leading five interceptions, and he has returned three of them for touchdowns.
"They are a big man-under team and he's involved whether he's in the middle of the field cheating towards routes or playing quarters and jumping on underneath routes and those types of things," Kubiak said. "But they're a very aggressive defensive football team and when they touch the ball they're very capable of taking it right back the distance. So, we're going to have to keep it out of their hands."