The Terrors captain is yet to feature this term, having fractured his cheekbone in the pre-season friendly against Leeds United.
Dillon replaces full-back Conor Townsend, who faces a month on the sidelines to recover from a foot injury.
Hamilton are almost at full strength for today's trip to Tannadice Park, with striker Andy Ryan their only absentee.
Dundee United: Cierzniak, Watson, Morris, Fojut, Dillon, Rankin, Paton, Bilate, Mackay-Steven, Erskine, Ciftci
Hamilton: McGovern, Gordon, Canning, Gillespie, Imrie, Crawford, MacKinnon, Andreu, GarciaTena, Redmond, Antoine-Curier