Hall was injured in the first quarter of Sunday's game while covering Lions' wide receiver Calvin Johnson. Initially called an "Achilles injury", its severity is as yet unconfirmed. With Hall out of the lineup Johnson caught nine passes for 155 yards and two touchdowns.
If Hall is lost for the season it would cause a huge weakness for Cincinnati's secondary. Entering Sunday's game he totaled 20 tackles, seven passes defended and one interception, but more importantly he was a much-needed veteran presence for the defense.
It's likely Adam Jones will move into the starting role if Hall is unable to play. Jones would start across from Terence Newman who suffered an injury scare in practice but was able to play in Sunday's game. Jones has amassed 25 tackles and an interception in seven games this season and started five games for Cincinnati in 2012.