Duke star forward Cooper Flagg will be absent for his team’s ACC tournament semifinal showdown against archrival North Carolina Friday after an ankle injury suffered in the Blue Devils’ 78-70 victory over Georgia Tech on Thursday.

Duke freshman Cooper Flagg appeared to injure his left ankle after slipping under the basket and was helped to the locker room by two teammates late in the first half. He did not return.

Duke has bigger problems than trailing Georgia Tech at halftime in the ACC Tournament quarterfinals. Late in the first half, star freshman forward Cooper Flagg suffered a lower left leg injury and required assistance getting off the court.