Rangers manager Walter Smith is set to name a largely unchanged squad.
The Scottish champions came through Saturday's 4-0 win over Hearts unscathed, meaning no fresh injury concerns ahead of the clash.
Rangers were also boosted by the return of Lee McCulloch, who came off the bench to make his first appearance since early February.
Dundee United midfielder Danny Swanson is doubtful for the trip.
Swanson has a tight hamstring and United manager Peter Houston has rated his chances as "50-50".
Darren Dods is a long-term absentee with a knee injury.
Rangers (from): McGregor, Whittaker, Papac, Weir, Bougherra, Wylde, Davis, Edu, McCulloch, Naismith, Lafferty, Healy, Jelavic, Diouf, Hutton, Fleck, Foster, Alexander.
United (from): Pernis, Dixon, Dillon, Kenneth, Van der Meulen, Watson, Severin, Douglas, Buaben, Gomis, Conway, D Robertson, S Robertson, Swanson, Daly, Shala, Russell, Goodwillie, Dow, Hill, Banks.
