Fisher filled in for injured left tackle Cordy Glenn during a 35-20 loss to the Cleveland Browns on Sunday and got hurt, leaving the Bengals (5-6) with no depth on the line. Glenn, who also has a back injury, hasn't practiced this week as Cincinnati gets set to host Denver (5-6).
Smith was the Bengals' first-round pick in 2009 and played seven seasons in Cincinnati before going to Minnesota in 2016. He returned to the Bengals for the 2017 season and wasn't signed to a new deal. He played for Arizona and was waived on Monday.