Fuller said he "will know more later" Monday about how long he will be out of the team's lineup.
The 22-year-old Fuller, a first-round pick out of Virginia Tech, stepped into an immediately significant role with the Bears this season after veteran Charles Tillman ruptured his triceps in Week 2, ending his season. Fuller has three interceptions and 33 tackles this season.
Veteran corner Sherrick McManis took over for Fuller on Sunday, when the team lost 27-14 at home to the Dolphins. It was the Bears' third loss in four games, and their third-straight loss at home. The latest loss led to what one reporter described as an "ugly scene" full of yelling in the Bears' locker room.
Chicago dropped to 3-4 on the season. The Bears play the New England Patriots on the road on Sunday afternoon.
- Brett LoGiurato