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Posted by ESPN.com's Adam Rittenberg
Offensive line will undoubtedly be Michigan's biggest question mark the rest of the season, and head coach Rich Rodriguez said more changes could be on the way despite Saturday's dramatic comeback against Wisconsin.
If Perry Dorrestein comes back healthy from a knee injury, he likely will line-up at left tackle this week against Illinois (ABC, 3:30 p.m. ET). Mark Ortmann, who started at left tackle against Wisconsin, will be auditioned at left guard.
Converted defensive lineman John Ferrara started at left guard against the Badgers.
Michigan ranks 15th nationally in sacks allowed (.75 sacks per game) but 110th in total offense (285 ypg).