Smith did not practice Monday morning. Coach John Fox said only that he's day to day.
Smith was shaken up after making a leaping 19-yard catch in the first quarter of Saturday's 23-20 overtime win against Indianapolis. He continued to play, but quarterback Matt Moore said he knew something was wrong with Smith.
The receiver was suspended for the first two regular-season games for breaking teammate Ken Lucas' nose in a fight during practice this month.
Lucas did conditioning drills on an adjacent field Monday, but is still not cleared to practice after he underwent a procedure last week to set his nose.