On-loan Rangers defender Webster has recovered from flu and returned to training on Monday, so will play at McDiarmid Park.
Winger Jennison Myrie-Williams is carrying a calf knock but is expected to be okay, while Lee Wilkie, Francisco Sandaza, Paul Dixon, Scott Robertson, Jon Daly and Kevin Smith all remain sidelined.
United (from): Weaver, Dods, Kenneth, Webster, Dillon, Kovacevic, Fotheringham, McCord, Myrie-Williams, Swanson, Buaben, Gomis, Conway, D Robertson, Cadamarteri, Goodwillie, Shala, Casalinuovo, Banks.
