Practice notes: No Spitz

Just when it looked like the Packers had their offensive line back to normal, it's starting to look like center Jason Spitz is a question mark for Sunday's game against Detroit.He didn't appear to do anything during the portion of practice open to reporters. He was added to the injury report yesterday with a back problem.The only other surprise was the absence of fullback Quinn Johnson, who had not previously been on the injury report. With Korey Hall (calf) already ruled out, Johnson was expected to play on Sunday. Running back DeShawn Wynn also did not practice.Left tackle Chad Clifton (ankle) and safety Atari Bigby (knee) appear set to return after lengthy absences. Clifton went through the jog through portion of practice, while Bigby appeared to be a full participant.Coach Mike McCarthy will address reporters in about an hour. We'll have an update then.-- Rob Demovsky, rdemovsk@greenbaypressgazette.comhttp://twitter.com/RobDemovsky