The Panthers say Cam Newton had successful surgery on his left ankle and the two-time Pro Bowl quarterback will be sidelined for four months.
Panthers team physician Robert Anderson performed the surgery on Wednesday in Charlotte.
Panthers head athletic trainer Ryan Vermillion says in a release that "Dr. Anderson did not find anything unexpected in the procedure and the surgery went well."
Newton first tweaked the ankle in a regular season game against New Orleans late in the season and then experienced some additional problems in Carolina's playoff loss to San Francisco on Jan. 12.
The team had hoped the ankle would heal on its own but after two months Newton was still experiencing discomfort.
Newton is expected to be ready in time for training camp.