Carolina Panthers rookie running back Jonathon Brooks has been officially listed as doubtful for the upcoming Week 8 game against the Denver Broncos due to a knee injury. Despite having his practice window opened, Brooks has struggled to participate fully and is likely to miss his NFL debut this week. Chuba Hubbard is expected to lead the backfield in his absence, with Miles Sanders taking on a secondary role. Brooks may have a chance to return in Week 9 against the New Orleans Saints if he is ruled out for this week.