Bucs coach Todd Bowles announced the injury in his postgame interview.
Barrett will undergo an MRI on Friday to confirm the tear, but Achilles injuries are easily diagnosed.
«It doesn't look good,» Bowles said.
Barrett suffered the injury in the early stages of the third quarter on an 11-yard run by Gus Edwards. He needed assistance getting to the sideline and was eventually seen being carted to the locker room. He was also seen leaving the locker room on crutches and in a boot. Prior to going down, Barrett totaled four tackles (three for a loss) and a sack.
It would be a tough blow for the already thin Bucs' squad.