The Green Bay Packers have a big question mark across the entire offense after the unit's performance these past few weeks. However, they have an urgent one at a critical position this week as they prepare to take on the Detroit Lions on Thursday night.

After Wednesday's practice, the Packers listed both of their top two centers, Corey Linsley and JC Tretter, as questionable for the game. Tretter's injury comes as a surprise, as he was not listed on the report prior to Wednesday. He was limited today with an ankle issue, however, suggesting that whatever problem exists happened during practice.

If both players are forced to sit out, that puts the Packers in a tough spot on the offensive line. T.J. Lang might be pressed into emergency duty at center, with Josh Walker filling in for Lang at right guard. Of course, that's assuming that Lang can play as well, as he is also listed as questionable. Meanwhile, Bryan Bulaga has not practiced all week and is also listed as questionable. It's all speculation at this point as to which players will be able to go on Thursday, and it's possible that one or both of the centers will still play, but we will be refreshing our browsers constantly at about 90 minutes prior to kickoff tomorrow night to see the inactive list.

Here's the full injury report, which does feature a bit of good news - Jared Abbrederis and Micah Hyde are Probable and appear ready to return to game action after practicing fully all week.

Packers Injury Report

Out

WR Ty Montgomery (ankle)

Questionable

OT Bryan Bulaga (ankle)

G T.J. Lang (shoulder)

C Corey Linsley (ankle)

CB Damarious Randall (knee/hamstring)

C JC Tretter (ankle)

Probable

WR Jared Abbrederis (rib/chest)

CB Demetri Goodson (illness)

DB Micah Hyde (hip)

ILB Nate Palmer (foot)

G Josh Sitton (back)

The Lions have a number of starters listed as questionable, and one key player out for the game. Here's what their injury report looks like:

Lions Injury Report

Out

WR Lance Moore (ankle)

Questionable

WR Calvin Johnson (ankle)

K Matt Prater (illness)

S Glover Quin (ankle)

DT Caraun Reid (ankle)

C Travis Swanson (ankle)

G Larry Warford (concussion)

Probable

S James Ihedigbo (hamstring)

WR Golden Tate (calf)

DT Gabe Wright (ankle)

A pair of the Lions' questionable players - Reid and Swanson - did not practice on Wednesday. Warford was a full participant, however, and should be able to play barring any setbacks from his concussion. Johnson, Prater, and Quin all were limited, but it would be a surprise if any of them would not suit up tomorrow night.