Three-time Defensive Player of the Year J.J. Watt has undergone a back surgery and could be in doubt for the Houston Texans' season opener, the NFL reported Thursday on its website.
Watt will begin training camp on the injured list and the timeline for his recovery is unclear, making him doubtful for Houston's season opener against the Chicago Bears on September 11.
Watt, 27, is widely considered the top defensive player in the NFL and has never missed a game during his stellar five-year career at defensive end.
A four-time Pro Bowler, Watt led the league in sacks last season with 17 1/2 and helped the Texans finish atop the South Division.
Renowned for his toughness Watt played through various injuries last season including a herniated disk in his back.
