Andre Johnson falls in the second quarter. (Dave Einsel / AP)

Houston Texans wide receiver Andre Johnson will undergo an MRI, but the team says that he suffered a strained right hamstring in Houston’s victory over the Pittsburgh Steelers.

“The way he went down was deflating...It’s like he just got shot, so that scares the heck out of you,” Coach Gary Kubiak said, via the Houston Chronicle.

Johnson fell to the turf without being touched after a 10-yard reception; at first, he appeared to grab his knee . He walked off the field but did not return to the game.

“We think it’s hamstring-related. It’s in the lower leg,” Kubiak said.