Mark Robins' side have fallen to their second league defeat of the month after losing 1-0 at Vale Park.
Nathan Smith's late goal was the only thing to seperate the two sides on a closesly fought afternoon in Staffordshire.
“It was disappointing. It is a difficult place to come because they have some threats in their side, but we were well in the game", said Robins.
“It was another chance to go third into the automatic places and we turned it down.
“We got into some decent positions and didn’t have any quality at the end of it to get a chance or shot on goal or on target.
“One shot on target is not good enough. We need more quality to turn those openings into goal scoring chances, so that’s the disappointment and those were the frustrations really.
“We dealt with everything apart from a mix up at the back in the second half when there was a lack of communication between the centre-half and goalkeeper.
“And then there was a switch off for the goal. Having dealt with the set play the ball goes out for a throw-in and we haven’t adjusted quickly enough, and that was a real disappointment.
“It was a really, really poor goal to give away.”
Coventry were forced into making one change before kick-off as Peter Vincenti missed out through injury and was replaced by Tom Davies, forcing Jordan Wilis to right-back and Jack Grimmer into an advanced right-midfield role.
“Losing Peter Vincenti threw things and we had to roll the dice again but it was a tough game, really tough game.
“I have no idea how long he’ll be out because we still don’t know what he’s done because there are no scans available in the Christmas period.
“So we’ll hopefully do that in the next few days but he’s in a bit of pain at the minute and got a bit of swelling so we will have to wait and see what it is.
“We created some really good openings in the first half, especially. We huffed and puffed and really kept them at bay but it’s really difficult place to come.
“We have got some match winners in the side but we didn’t have that quality in the final third to get anything from the game, and then when we conceded we had to claw our way back into the game but should have at least had a goal to our name by then.
He added: “The beauty of it is we can pick up points again on Saturday.
"We have got a long trip to Carlisle so let’s put this disappointment behind us and go and get three points there."