One of Houston's starting cornerbacks hit the showers early on Saturday.
Johnson fell awkwardly after surrendering a 40-yard reception to Marquise Goodwin down the left sideline on the third play of the game.
Texans coach Bill O'Brien told reporters that Johnson went to the hospital, adding, "I think he's doing OK considering what happened. I think he's going to be OK, but I don't know the details yet."
Johnson is the entrenched starter across from veteran Johnathan Joseph, but Houston employs battle-tested defensive backs ready to start behind him, like Johnson Bademosi and Aaron Colvin, if Johnson's injury persists into the regular season.