Steve Cotterill was disappointed with his side following a 2-2 draw with Bradford, despite extending their unbeaten run to 14 games.
Christopher Routis shocked Bristol City with an 86th-minute equaliser as Bradford twice came from behind to earn a 2-2 draw.
Team news for Tuesday's League One clash between Bristol City and Bradford City at Ashton Gate.
Bristol City manager Steve Cotterill was delighted with his side's 3-1 victory at Coventry.
Bristol City maintained their five-point lead at the top of League One after a 3-1 win at Coventry.
Team news for Saturday's League One clash between Coventry City and Bristol City at the Ricoh Arena.
Preston travel to Lancashire rivals Oldham, while Bristol City host AFC Wimbledon in the pick of the games in the Johnstone Paint Trophy area quarter-final draw.
Paul Cook was gracious in defeat after Chesterfield had brought the best out of league leaders Bristol City in their 3-2 loss.