Watt, on loan from Arsenal, has missed the last four games due to a hamstring problem, while McCormack has struggled for full fitness all season, making only one start for Leeds since arriving in the summer.
Another summer signing, Billy Paynter, is in contention after stepping off the bench against Hull in midweek, while a group of players, including Lloyd Sam, proved their fitness in a behind-closed-doors friendly against Liverpool.
But midfielder Amdy Faye is still doubtful with the hamstring problem that forced him off in last weekend's win at Coventry and kept him out of the midweek clash with Hull.
Manager Simon Grayson recalled Alex Bruce on Tuesday night and must decide whether to stick with him alongside on-loan Bolton defender Andy O'Brien, or recall Neill Collins.
Source: PA
