The person spoke to The Associated Press on Thursday night on condition of anonymity because the team hasn't confirmed the surgery or Watts' roster status.
.@HoustonTexans JJ Watt can return week 1 but also could miss some time. Back is never 100% after surgery. Watt regularly does impossible.— Dr. Mark Adickes (@jocktodoc) July 22, 2016
Watt, the NFL sacks leader last season with 17 1/2, will miss the start of training camp, but is expected to be ready for the season opener.
Watt spent most of the offseason recovering after having surgery to repair a groin injury in January.
His performance last season helped the Texans to their first playoff berth since 2012 and gave him his second straight Defensive Player of the Year Award.
The surgery was first reported by ESPN.
I don't expect JJ Watt to miss any games during the regular season, but why is he having surgery this close to training camp? He'll be ready— David Nu?o (@DavidNunoABC13) July 22, 2016