The rising junior from Memphis, Tennessee was playing in a Pro-Am game Thursday at North Carolina Central University in Durham when the injury occurred. Surgery has not been scheduled.
"I just hate this for Leslie and his family," head coach Roy Williams said."He's worked so hard this off-season and he told me he was really playing well. We'll certainly support him as he works to get back on the floor, but we will miss his play on both ends of the court."
McDonald was second on the team last year with 51 three-point field goals and averaged 7.0 points per game. He scored a career-high 17 points against Long Beach State, one of 10 games last year in which he scored in double figures.