Wisconsin sophomore linebacker Chris Borland will miss the remainder of the season because of recurring problems with his surgically repaired left shoulder.
Borland, the 2009 Big Ten Freshman of the Year, re-injured the shoulder early in Saturday's 20-19 win against Arizona State and has been undergoing tests.
Borland is eligible for a medical hardship, which would allow him to retain three years of eligibility. He will apply for a waiver at the end of the season.
"After talking with our training staff and with Chris, we decided that the best thing for Chris was to shut him down for the rest of the year," Wisconsin coach Bret Bielema said in a prepared statement. "Obviously, Chris is a tremendous player and a ferocious competitor, but after looking at all the options, everyone agreed this was the only option for him."
Borland underwent surgery in January to repair a torn labrum and missed all of spring practice. He played in Wisconsin's opener at UNLV but reinjured the shoulder.
He sat out Sept. 11 against San Jose State before returning Saturday.
Borland started six games last season and tied for second in the Big Ten with five forced fumbles. He also recovered three fumbles and made 54 total tackles, including 10½ tackles for a loss and five sacks.
Adam Rittenberg covers Big Ten football for ESPN.com. He can be reached at firstname.lastname@example.org