Andre Johnson left the game in the fourth quarter, and head coach Gary Kubiak said the wide receiver was "being evaluated" for a concussion.
"He's being evaluated as we speak," Kubiak said after the Texans' overtime victory at Reliant Stadium over the Titans. "I have no diagnosis yet."
Johnson caught a 21-yard pass from Matt Schaub up the right sideline, and was hit by Titans' safety Bernard Pollard as he was coming down with the ball. He was able to run off the field a few moments later, and then jogged into the locker room without his helmet a few plays later.
Tight end Owen Daniels had encouraging words about Johnson's status.
"I talked to him and he said he was all right," Daniels said. "He wanted to go back in, but protocol is that you can't at that point."
Johnson finished with 76 yards receiving on a game-high eight catches.