Grant Milton, a senior at The Woodlands High School, suffered an injury in a playoff game on Saturday that required emergency surgery.
A GoFundMe page was started to accept donations toward medical costs and living expenses while the family is dealing with the injury. Watt included a note with his donation, saying, "If there's anything that I can do to help, please let me know. Sending my best wishes to Grant and the entire Milton family."
Watt also retweeted a link to the GoFundMe; as of 12:30 p.m. CT, more than $75,000 had been raised in two days.
"Obviously that doesn't surprise me at all," Texans head coach Bill O'Brien said. "J.J.'s somebody who cares very much about the community, individual kids. JJ loves high school football. ... And I'm sure he feels horrible about what happened to that young man. And so I think it doesn't surprise me at all. I think for every one story you hear about J.J. doing that, or [any player] doing that, there's probably 10 other stories that you've never heard about. And I think that's what makes it pretty neat."
On Wednesday morning, the Milton family posted an update on Grant's condition, saying, "The recent scan shows his brain stem has now returned to normal form. ... Grant is still breathing over the ventilator which makes us hopeful that at some point he can breath on his own but it will be some time before we get to that point."