Ohio State could have only 60 percent of its usual starting offensive line available for the Rose Bowl against Washington.
Thayer Munford, the sophomore who earned honorable mention All-Big Ten in his first season as the starting left tackle for the Buckeyes, did not take part in a practice Thursday that was open to the media.
Josh Alabi filled his spot.
A school spokesman had no update on Munford, who started every game despite battling a hip injury for much of the season.
He missed most of a win at Maryland on Nov. 17 with a leg injury but returned a week later for the Michigan game.
Ohio State is already without Demetrius Knox, a Springfield native who suffered a severe foot injury in the Michigan game in late November.
Wyatt Davis started the Big Ten Championship game in his place a week later and will do so again against Washington.
Munford and Knox were both present as the Buckeyes practiced on a sunny day at the SubHub Center in Carson, Calif.
Ohio State will have another open practice on Friday, and starters and backups are scheduled to be available to the media on Sunday.