Diouf missed the weekend draw at Crystal Palace through illness and is likely to return to the substitutes' bench.
Boss Neil Warnock could name an unchanged starting line-up for the sixth successive game with Steve Morison set to resume up front alongside Ross McCormack.
Warnock has no new injury or suspension problems as Leeds look to extend their unbeaten league run to six matches.
Midfielders Rudy Austin and Michael Brown, winger Ryan Hall, defenders Aidy White and Jason Pearce, plus striker Habib Habibou are all pushing for places in the starting XI, but will have to be patient as Warnock sticks with a settled side.
- Sports & Recreation
- Neil Warnock
- Steve Morison