North Carolina's Roy Williams announced Tyler Zeller will miss four to six weeks with a stress fracture in his right foot.
"He's frustrated," Williams said at a Friday press conference.
Zeller is a sophomore who missed much of last season with a broken wrist. The 7-foot sophomore is averaging 9.6 points and 4.6 rebounds in 16.4 minutes per game this season. He's scored at least 12 points in six different games.
North Carolina plays Georgia Tech on Saturday.
The 12th-ranked Tar Heels are 12-5.