Motherwell manager Stuart McCall has selection problems ahead of the game, with Francis Jeffers unlikely to recover from a hamstring injury, Gavin Gunning out with a shoulder problem and one or two others facing fitness tests.
Keith Lasley is a slight doubt after taking a knock to his ribs but Steve Jennings is suspended.
Dundee United defender Garry Kenneth returns to the visitors' squad having returned to training following a knee injury.
Peter Houston could also turn to defender Scott Severin, who made his comeback from the bench against Rangers last weekend. Long-term absentee Darren Dods (knee) is still out.
Motherwell (from): Randolph, Saunders, Ross, Hammell, Hutchinson, Craigan, Lasley, Hateley, Murphy, Jones, Humphrey, Sutton, McHugh, Casagolda, Page, Forbes, Meechan, Hollis.
Dundee Utd (from): Pernis, Dillon, Dixon, Watson, Kenneth Van der Meulen, Severin, Douglas, Buaben, Gomis, Conway. D Robertson, S Robertson, Swanson, Daly, Shala, Russell, Goodwillie, Dow, Hill, Banks.