J.J. Watt was back at work on Friday.
The defensive end didn't practice on Wednesday and Thursday because of a groin injury, but was on the field with his teammates in the morning at the Houston Methodist Training Center.
"He was moving around," head coach Bill O'Brien. "He'll be out there on Sunday."
The Texans practiced earlier on Friday because of an 11 a.m. CT conference call with the NFL Player's Association.
Watt and the Texans will fly to Buffalo on Saturday. Kickoff is at noon CT.