Reed will already miss the organized team activities and now the team is concerned he will miss valuable training camp time and part of the preseason.
Defensive coordinator Wade Phillips admitted he's a "little concerned" because of the timing of Reed's surgery.
Reed will be 35 in September and this will be his second hip surgery. The nine-time Pro Bowler has only missed 16 games in his 11-year NFL career. Reed signed a three-year, $15 million contract with the team in March, with $6 million in guarantees
"We didn't expect it, but it started bothering him," Texans head coach Gary Kubiak said. "That's when we got aggressive in what we needed to do."