Jackson walked off the field under his own power during a team drill late in the session. He did not return.
Friday night's practice also saw the return of defensive tackle Marcell Dareus. After passing his conditioning test Thursday, Dareus was in full pads and participated in team drills Friday, recording a "sack" of quarterback EJ Manuel early in practice.
Dareus was joined in practice by defensive tackle Alan Branch, who also passed his conditioning test Thursday.
Tight end Chris Gragg, who was released from the hospital after being treated for heat-related issues, was on the sidelines but did not participate. Linebacker Randell Johnson, who was activated from the physically unable to perform list, also did not participate.
Fullback Evan Rodriguez returned to practice after being released from the hospital earlier week.