Smith played a career-low 11 games last year after suffering a mid-season knee injury. Carter and Chubb aggravated their knees during minicamp.
"We were very cautious," general manager Marty Hurney said. "(Smith's) doing well. With him and Jermaine, I think it's just they're not quite 100 percent. We want to give them a period of time and we can bring them off active PUP at any time."
View photos of Panthers players arriving at Wofford College for 2019 training camp.