Johnson and Levy were two of eight Detroit players to miss practice Thursday. Joining them were cornerbacks Chris Houston (toe) and Bill Bentley (head), safety John Wendling (ankle), returner Micheal Spurlock (theoretically still traveling to Detroit) and offensive linemen LaAdrian Waddle (ankle) and Dylan Gandy (unknown).
Some number changes, too. Carlin Isles, a rugby player signed to the practice squad Thursday, is wearing No. 16. Cody Wilson, a practice squad receiver, is now wearing No. 1, presumably opening up No. 15 for Spurlock's return.
Also, the Lions sent Dorin Dickerson (head) to injured reserve and promoted Matt Veldman to the 53-man roster for Sunday. This gives Detroit two tight ends -- Veldman and Joseph Fauria -- for when the Lions face the Vikings.