The Bengals did not specify the violation and said there would be no further comment until after the game.
Johnson had ankle surgery in June and a shoulder injury in August and has not been as involved in the Bengals' offense as much as previous years. Meanwhile, his former college teammate, T.J. Houshmandzadeh, has become the team's primary receiver.
Houshmandzadeh leads the NFL with 73 catches, and has four touchdowns. Ocho Cinco, a down-field threat in previous years, has 41 catches, none for more than 22 yards.
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