NaVorro Bowman could miss the entire 2014 season as he works to return from a torn ACL and MCL in his left knee.

Bowman underwent surgery in February and has been experiencing pain recently.

Bowman underwent an MRI earlier in the week, which checked out "fine," but now it appears his season is in jeopardy. If Bowman isn't cleared to practice by Nov. 18, he won't be able to play the remainder of the season.

The San Francisco 49ers are already without Patrick Willis for the rest of the season.