Mark Robins' side fell to a 2-1 defeat away at Walsall, and the City manager was left bitterly disappointed in the final minutes at Banks’s Stadium.
The Sky Blues initially took the lead courtesy of a Luke Thomas strike in the 18th minute.
However, Luke Leahy struck twice in stoppage time to give the hosts all three points and Robins spoke about his dissapointment.
He said: “If we take our chances we could’ve been three or four up.
“They [Walsall] have not done anything.
“It was a horrendous mistake for the equaliser and then on the back of that the referee has given a penalty which is never a penalty.
“I’ve just watched it back and it’s never a penalty in this world."
The Sky Blues manager admitted it was 'very difficult' to take, having had the points snatched away so late on.
“This is very, very difficult to take because apart from those four minutes we had the rest of the game, we should be talking about a great three points." He said.
“The decision making was appalling at the end, but anyone can make mistakes.
“It was a bad mistake and he’ll have to bounce back from that.
“But what we stopped doing is what got us into the lead in the first place.”
The City boss then spoke on the second-half performance which saw his side have a collection of opportunities to put the game to bed.
“We had a Luke Thomas opportunity, a Shipley opportunity and a Clarke-Harris opportunity which were all great chances.
“If we score one of those we go on to win the game, because the game would then open up even more.
“We just looked nervy as soon as we didn’t take the chances.”
From last month’s fixture against Fleetwood, five changes were made to the starting eleven and Robins was pleased with the team’s performance up until the 90th minute.
“We talk about change and what makes us better and gives us better opportunities to win games.
“We have a good squad and we have to find a way to get everyone in, and today they’ve done nearly everything right.
“Even if we’d seen it through and won the game 1-0 then we’d have been talking about a really good performance.
“We’ve now got to learn about it, stay strong and come through it, and not slip into bad habits.”