Jennings has been out of practice since he sustained a concussion in the Packers' Aug. 3 "Family Night" scrimmage at Lambeau Field. McCarthy said Friday that Jennings had progressed through the protocol for returning from head injuries and was close to returning.
The Packers' next practice is Sunday.
McCarthy also says linebacker Desmond Bishop had surgery Friday after tearing his right hamstring in the Packers' first preseason game.
It is not clear if Bishop will miss the season, although McCarthy said previously that his season was in jeopardy.