Sheffield United are facing a fine after their Capital One Cup semifinal first-leg defeat to Tottenham.
The Daily Mail says United were delayed by bad traffic from their pre-match hotel in North London - and the Football League have written to South Yorkshire club for a formal explanation of how it happened.
Competition rules state team-sheets must be handed to the referee by the manager and captain no later than 75 minutes before scheduled kick-off.
Nigel Clough and his players did not arrive at White Hart Lane until 40 minutes before the original kick-off time of 7.45pm, for Wednesday's game, which Spurs won 1-0.
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