The MRI revealed he's still dealing with bone edema, which is a buildup of fluid in the bone marrow. "Following a brief period of immobilization, Porter will resume a program of non-impact activities and targeted therapy," the team added.
The 26-year-old last appeared in a game for Chicago on Nov. 6 against the Atlanta Hawks. He played nearly 12 minutes before exiting and later being ruled out for the second half of the contest with a left foot contusion.
Porter averaged 11.2 points and 3.4 rebounds in 25.1 minutes as a starter through nine games before suffering the injury.
The Bulls have struggled to an 8-14 record, including a 5-8 mark in Porter's absence.