Exum was diagnosed Friday with a partially torn patellar tendon in his right knee and will be out indefinitely, the Jazz said.
The extent of his injury was revealed Friday in an MRI. He will continue to seek opinions on how best to treat the injury, according to the Jazz.
Exum had returned Monday 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.