Hayden Foxe looks likely to make his first competitive start in a Leeds shirt and Sean Gregan is expected to partner the former Australian international in central defence.
Neil Sullivan is set to return to the starting line-up after a thigh injury, with Fulham's Tony Warner prevented from playing by the terms of his loan deal.
Winger Seb Carole is pushing for his full team debut as Steve Stone begins his recovery from a groin strain, and both Shaun Derry and Ian Westlake could make way for other players tonight.
Danny Rose and Jonathan Howson have been included in Blackwell's squad and are expected to be involved, while Jermaine Beckford is in contention to lead the attack after appearing as a substitute against Cardiff.
United (from): Sullivan, Richardson, Gregan, Foxe, Marques, Crainey, Kilgallon, Bakke, Morris, Westlake, Einarsson, Howson, Rose, Carole, Blake, Beckford, Moore, Wilberforce, Healy.