"Ruegamer has done a great job on his rehab and has really helped himself," said Packers coach Mike Sherman.
Ruegamer did not practice Wednesday but is expected to participate Thursday.
With Ruegamer sidelined Wednesday, Wells took the snaps with the first-team offense, as he did during the Eagles game.
Sherman gave Wells a solid review, with the exception of the botched shotgun snap during the second quarter. If he starts, Wells — who's only 6-foot-2 and 300 pounds — will be in for a huge challenge against Detroit's Dan Wilkinson and Pro Bowler Shaun Rogers, who tip the scales at about a combined 700 pounds.
"Wells is a pretty good athlete. He has good feet. Obviously, he's blessed with a low center of gravity," Sherman said of the former high school wrestling champion. "So that helps him a little bit. But he has good feet, he's tough, he's physical (and) very intelligent. I think he's going to be a fine center in this league."
As for Diggs, who spent Sunday and Monday in the hospital, he stayed home Wednesday and will not participate in Thursday's practice. Paris Lenon, who replaced Diggs in the Philadelphia game, likely would start against Detroit if Diggs doesn't make a dramatic recovery.
"It's going to take over a month for (those injuries) to get close to healing," Sherman said. "But I think the pain that they deal with has significantly decreased."
Green, who has sprained rib cartilage, and Davenport, who has cracked ribs, practiced Wednesday.
Here is this week's injury report.
DOUBTFUL (25 percent chance of playing): CB Fernando Bryant (ankle).
QUESTIONABLE (50 percent chance of playing): DE Kalimba Edwards (foot).
DOUBTFUL: LB Na'il Diggs (kidney).