The team called the injury a sprained knee, with Bulluck's return questionable.
He was hurt defending on third-and-2, and his knee appeared to buckle under him. He was on the ground for a couple minutes and had to be helped off the field, though he started walking without assistance once he reached the sideline.
The 10-year veteran had started his 127th straight game Sunday. He was the AFC defensive player of the week for intercepting two passes in last week's 47-7 win over St. Louis.