Both players missed the derby defeat to Huddersfield due to injuries sustained in the previous game against Peterborough.
McCormack took a blow to the head and Morison was forced off with a calf strain.
Habib Habibou made his debut alongside El-Hadji Diouf up front for Leeds against Huddersfield in their absence, but Warnock could be tempted to start with McCormack and Morison if they are fit.
Midfield pair Paul Green (Republic of Ireland) and Rudy Austin (Jamaica) are both expected to be in contention following international duty, while defender Tom Lees is likely to resume in the back four after appearing for England Under-21s.
Defenders Aidy White and Jason Pearce, plus midfielders Michael Brown and David Norris are pushing for recalls as Leeds bid to keep their fading play-off hopes alive.