From Clemson University:

Clemson, S.C.—Clemson junior fullback and tight end Garrett Williams had surgery to repair a torn ACL late last week and his status for the beginning of fall camp is unknown, Head Coach Dabo Swinney said Tuesday.

Williams suffered the knee injury during a spring practice and did not play in the April 8 Spring Game.

Over the last two seasons, Williams has played in all 30 Clemson games, 28 of which have resulted in victories. The native of Orlando, Fla., has two receptions for 21 yards and has played 252 career plays from scrimmage, plus many others on special teams. He has had a major impact on Clemson’s ground game the last two years.

William Corbin’s Take: This is a significant inury for the Tigers, and he was my favorite to win the tight end job. He is an excellent blocker and would have boosted Clemson’s running game with his blocking. ACL injuries usually take a year to recover, and even fast recoveries take eight to nine months. I would expect him to take a medical redshirt this year so that he has two years to play fully healthy.