J.J. Watt

Houston Texans defensive end J.J. Watt is as tough as it gets. Last season, he played through serious injury and still won Defensive Player of the Year.

Well, the 27-year-old underwent back surgery on Thursday (July 21), reports ESPN, his second surgery in six months.

Watt is now recovering and expected to miss training camp and the preseason, but will be ready at the start of the upcoming NFL season. However, team sources say there is concern that his availability for the early part of the season could be compromised.

Watt has never missed a regular-season game.

Last season, he played through a herniated disk in his back, and had surgery for a disk issue. He also had a broken hand and five torn muscles in his core area last season, and had major surgery to repair the muscles after last season ended and had been rehabbing ever since.

Despite the injuries, Watt won his third defensive player of the year award, and recorded 17.5 sacks.