CHARLOTTE -- Rookie cornerback Donte Jackson (groin) returned to practice on a limited basis Friday and is questionable for Sunday's game against the Bengals.
Head coach Ron Rivera said Jackson moved around well, calling it "very encouraging."
Wide receiver Damiere Byrd (knee) was limited all week and he's also listed questionable, though Rivera didn't sound as encouraged.
"He moved around really well," Rivera said of Jackson. "We'll see how he is tomorrow after some treatment this afternoon and tomorrow morning and we get a good feel for it.
"Damiere moved around, hmm, not as much as you would like him to, but we'll see how he is in the morning before we draw any conclusions."
Guard Trai Turner and safety Da'Norris Searcy are out with concussions. Turner, tight end Greg Olsen (foot) and wide receiver Curtis Samuel (medical illness) will be out for the second consecutive week.
"Trai did a lot of good work today, as did Greg Olsen. Curtis continues in the rehab program," Rivera said.
Rivera didn't provide much when asked if there was any chance Olsen could play as early as Week 5 when the Panthers return from their bye week, simply saying the plan remains in place to check Olsen a month after the injury. Olsen hurt the foot September 9; they play the Giants on October 7.