Keith Hill saw his Barnsley side return from the Ricoh Arena empty-handed against Coventry City.
Teenager Paul Digby missed out despite the absence of midfielder David Perkins who has been ruled out for a fortnight with a knee injury. Midfielder Korey Smith made the final appearance of his current loan deal from Norwich City.
The matched looked destined to be a 0-0 draw, until City snatched a cruel late winner.
Gary McSheffrey crossed and Clive Platt headed home to stun the Tykes.
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