Derby have been dealt a blow with Johnny Russell out for up to six weeks with a hamstring injury.
Derby moved back up to second in the Championship as substitute Darren Bent inspired a 2-0 victory over Blackburn.
Steve McClaren was full of praise for Derby goal hero Darren Bent after beating Blackburn 2-0.
George Thorne made his long-awaited comeback from injury with a run out for Derby County's Under-21s.
Bradford's reward for knocking Chelsea out of the FA Cup is a fifth-round showdown with either Sunderland or Fulham.
On-loan striker Darren Bent was on target as Derby beat Chesterfield 2-0 in the FA Cup fourth round at the iPro Stadium.
Steve McClaren admitted he was relieved his game of risk paid off after Derby beat Chesterfield in the FA Cup.
Sheffield United have completed the signings of Paul Coutts and Kieron Freeman from Derby.
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