The team said in a release Thursday that Haywood will have surgery next week to repair the problem.
Haywood has been struggling with the ankle in recent days and had an MRI and CT scan on Wednesday ordered by foot specialist Dr. Bob Anderson. The team says the test results revealed a stress fracture in the navicular bone.
Surgeons are expected to place two screws in the bone to reinforce the stress fracture and help it to heal. Haywood will be immobilized for 12 weeks.
Haywood played in 61 games last season for Charlotte and averaged 3.5 points and 4.8 rebounds.