ESPN's John Clayton first reported the need for surgery on Sunday night.
Sherman injured his elbow during Seattle's NFC Championship Game victory over the Green Bay Packers but remained in the game.
It was reported after the game that Sherman had torn ligaments in his elbow, but the cornerback said he would "100 percent be able to play" in the Super Bowl.
In the NFC Championship game, Sherman suffered ligament damage in his left shoulder. He didn't miss a play from practice and played the entire Super Bowl with the injury. During the game, he was making tackles and plays using his left arm.
The source indicated that the injury was worse than just an elbow sprain. Although the source didn't indicate the prognosis and timetable, it is likely he will go [with] Tommy John surgery after the season.
The Seahawks lost the Super Bowl 28-24.
- Sarah Barshop