The hosts, who remain undefeated more than half-way through the English Premier League (EPL) season, found themselves challenged by a Bristol squad who were full of confidence on Tuesday after eliminating holders Manchester United in the quarterfinals, reports Efe.
Aiming for the quadruple: EPL, Champions League, FA Cup and EFL Cup, City fielded a strong side including Leroy Sane, Raheem Sterling, Bernardo Silva, Ilkay G?ndogan, Kevin De Bruyne and John Stones.
The injured Gabriel Jesus was unavailable and Ag?ero started the match on the bench.
Bristol, showing no signs of being intimidated by their mighty rivals, were more impressive than many Premier League teams have been in visits to the Etihad this season.
The Robins' boldness paid off with a goal just before half-time.
Bobby Reid exploited a giveaway by City's Eliaquim Mangala and lured John Stones into a poor challenge to win the penalty and then converted from the spot to make it 1-0 for Bristol.
City nearly equalized before the break, but Bristol defender Aden Flint came up with a timely header on the goal line to stop Sterling's shot.
The underdog visitors preserved the lead until the 54th minute, when De Bruyne scored for City after a give-and-go with Sterling.
Ag?ero's header in the 92nd minute gave City the win.
The second leg is set for January 23 in Bristol.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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