Green Bay Packers OT JC Tretter (knee) and S Morgan Burnett (quadriceps) did not participate in practice Thursday, Jan. 19. OG T.J. Lang (foot) and CB Quinten Rollins (neck, concussion) were both limited participants, while LBs Clay Matthews (shoulder), Julius Peppers (non-injury), Nick Perry (hand), Jayrone Elliott (hand) and WR Jeff Janis (quadriceps) all practiced in full.