The Sky Blues have been defeated 2-1 by Cambridge United in SkyBet League Two after goals from Jabo Ibehre and Uche Ikpeazu.
Mark Robins' side started the stronger but fell behind early on against a side who made the most of the little chances they created.
Duckens Nazon's second half goal did level the game ten minutes after the break but Ikpeazu's late header meant that the home side would take all three points.
"They did not deserve it," said Robins.
"The reaction of the supporters tells the story at the end when they applauded everybody off. The result was unjust.
"We have conceded two cross where they have managed to switch the play on us, get one in the box and their strikers have got a header on it.
"We were too deep for the first goal and we were very much on top for the second, but if we do not deal with the crosses into the box then Cambridge will punish you. They are very good at that.
In the final stages, City were presented with a number of glorious chances to snatch a point but U's 'keeper David Forde was on hand to deny first Stuart Beavon and later Maxime Biamou and Nazon.
"The amount of chances that we have created today stands us in good stead. It doesn't do anything for us today but there is enough there to be pleased about.
"Their keeper has done a brilliant job in keeping them in the game. He made some wonderful saves second half.
"Really, we are starting to look like a side who are going to create opportunities at will. We just have to keep going.
He added: "It is easy to get down about results because you want to win every game, that doesn't happen. We have to take this one on the chin and bounce back from it."