"Hurt his groin a little bit yesterday, so we held him out of practice," Bucs coach Lovie Smith said.
Mankins was the only addition to the Bucs' injury report. Johnthan Banks (knee), tight end Austin Seferian-Jenkins (shoulder), wide receiver Russell Shepard (hamstring) and center Evan Smith (ankle) didn't participate for the second consecutive day.
Mankins was seen walking on the practice field and observing offensive line drills while wearing red shorts and a white No. 70 practice jersey. In his absence, second-year reserve offensive tackle Kevin Pamphile had reps at left guard.
However, Lovie Smith said not to place too much meaning into where Pamphile took snaps.
"He gets reps at a lot of different places," Smith said. "I wouldn't put too much on where."