Brown was held out of practice on Wednesday:
Brown, who has been forced to step up this season with Minor limited by injuries, was wearing a red jersey (signifying an injury) and sweatpants at yesterday’s practice. He watched his fellow running backs from the sidelines as they stretched and broke off into position groups.
A reliable source says this is because he was concussed in a full-contact drill and he is very doubtful for this weekend. Minor is also still somewhat limited, so expect a fair dose of Michael Shaw in Iowa.
Meanwhile, it appears that Molk's recovery is going well and should be on the short side of the 4-6 weeks projected earlier:
Michigan will be without its starting center probably for another two weeks. …
"I still think it's way too early to do anything football-wise with pads on," coach Rich Rodriguez said Tuesday during the Big Ten teleconference. "I know he lifted for a little bit and ran around with the trainer some, but it's still a week or two until he's actually playing football."
That would see him return for the Penn State game if all goes well.