An own goal and a strike from Chris Martin helped Derby beat Cardiff 2-0 to go back to joint-top of the Championship.
Derby manager Steve McClaren admits his team must learn to be more ruthless, despite the comfortable 2-0 win at Cardiff.
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.
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