Morgan sat out the 1-0 win over Preston due to a calf strain and either Kyle Bartley or Nyron Nosworthy will make way.
Recent French signing Jean Calve scored a stunning winner on his debut against North End and will be fit despite leaving the field with cramp.
Blades manager Gary Speed will be without long-term absentees Darius Henderson (hamstring), Lee Williamson (back) and Ryan France (knee).
Speed will be taking charge of his third game following the departure of Kevin Blackwell last month as the Blades chase only their second league win of the season.
The match kicks off at 1pm.