The Tampa Bay Buccaneers have promoted center Josh Allen to the active roster, according to Greg Auman of the Tampa Bay Times. This move comes in light of Evan Dietrich-Smith's absence with illness this past week. If Dietrich-Smith can't start, Garrett Gilkey is likely to take his place, but Allen could conceivably function as a swing backup. Dietrich-Smith hasn't been the best center in the NFL, but his absence would be another blow to an already-horrible offensive line.
It's not clear who the Bucs are cutting to promote Allen. That might be rookie guard Kadeem Edwards, who hasn't played a single game this year, but it's more likely to be cornerback Crezdon Butler, who's struggled whenever he's received playing time and who was inactive last week, or cornerback C.J. Wilson, who was promoted to the roster two weeks ago and has yet to play a game.
Update: The Bucs officially announced promoting Allen to the 53-man roster, and the player they waived was indeed cornerback C.J. Wilson.