Michael Ricketts, who is due to return to Elland Road from his loan spell at Cardiff at the turn of the year, will not be allowed to play against United for the Welshmen on Saturday when Kevin Blackwell's side will be chasing a fifth successive win.
The Whites are chasing the top two, and the gaffa still believes the position is far from being a two-team league.
Blackwell: 'We will plug away, and I'm still looking at automatic promotion rather than settle for a play-off spot. Why shouldn't we do it? We are the team in form'.