NRG Stadium erupted when he was announced, and Watt ran out, emphatically waving the Texas flag, getting the crowd pumped up.
Watt, who went to the locker room near the end of the second quarter with a finger injury, said after the game that he "just busted the bone through the skin. Nothing bad."
In the two weeks since Houston was hit by devastating flooding, Watt has helped raise more than $30 million for a Houston flood relief fund. After returning to Houston, Watt and his teammates have spent time visiting those affected by the hurricane and donating supplies.
Before the game, the Texans honored first responders who served during Harvey and held a moment of silence for those who lost their lives in the storm's aftermath.
Watt electrifies Houston crowd with emotional entrance
J.J. Watt enters NRG Stadium to thunderous applause while waving the Texas state flag before Houston takes the field for its first game after Hurricane Harvey.