Deaver, a fifth-year senior, was injured in practice Monday morning. He can petition the NCAA for a sixth year of eligibility.
Deaver also missed the 2012 season after tearing the ACL in his other leg. He was suspended for summer workouts and the first five days of fall camp this season.
After leading all ACC tight ends in receptions last season, Deaver was named to the All-ACC third team.
Duke's first game of the season is against Elon on August 30.
- Dan Gartland