An MRI on Friday confirmed the tear of the Achilles for Barrett, who is expected to be sidelined seven-to-nine months, according to multiple reports.
Barrett suffered the injury during the third quarter of the Buccaneers' 27-22 loss to the Baltimore Ravens Thursday. This will mark the first season in his eight-year career that he will fail to play in at least 10 games.
Barrett, 29, recorded 31 tackles, three sacks and one forced fumble in eight games (all starts) this season.
A two-time Pro Bowl selection, Barrett has 348 tackles, 54.5 sacks, 19 forced fumbles and five fumble recoveries in 115 career games (69 starts) with the Denver Broncos (2015-18) and Buccaneers.