Diouf is available again after suspension for the Premiership match against Manchester City.
Diouf, who has weighed in with five goals this season, looks likely to replace Kevin Davies, who is banned.
Defenders Tal Ben Haim and Ricardo Gardner are pushing for places in the starting line-up but Quinton Fortune is again ruled out with an Achilles injury.
Provisional squad: Jaaskelainen, Hunt, Meite, Ben Haim, Faye, Pedersen, Gardner, Campo, Giannakopoulos, Nolan, Speed, Anelka, Diouf, Vaz Te, Al Habsi, Tal, Fojut, Smith.