1:33 PM ET
The extent of his injury was revealed the next day in an MRI.
Exum had returned after missing 25 games with a left ankle sprain and bone bruise.
Exum has appeared in 42 games (one start) in his fourth NBA season, averaging 6.9 points, 2.6 assists and 1.6 rebounds in 15.8 minutes. In the three games since his return, he was scoreless, with three assists and three rebounds in 27 minutes.