Webster is unavailable to play against his employers under the terms of his loan from Rangers, so Dods will start in his place.
Youngster Craig Hill has also been drafted into the squad to provide cover.
Midfielder Morgaro Gomis returns after a ban, but Scott Robertson is out with a groin problem.
Long-standing injury victims Francisco Sandaza (groin) and Lee Wilkie (knee) remain sidelined.
Terrors (from): Weaver, Dixon, Dods, Kenneth, Watson, Hill, Dillon, Kovacevic, Buaben, D Robertson, S Robertson, Swanson, Conway, Shala, Cadamarteri, Myrie-Williams, Goodwillie, Casalinuovo, Banks.