Mark Robins was disappointed in his side's performance in their last game of the 2018/19 season.
The Sky Blues fell to a 2-0 defeat versus Doncaster Rovers at Keepmoat Stadium.
Robins thought his team lacked a cutting edge throughout and spoke to the local press post-match.
He said: "We were toothless and we lacked that cutting edge.
"You don't want to see it but because there's not the same thing in the game for us as there was for them human nature sort of took over.
"It was really poor and I don't like seeing it, but I do understand.
"We haven't been ruthless and that's been our achilles heel this season.
"Between the boxes is really good, in the boxes we've seen a couple of errors and that cost us two goals."
Robins reflected on the season after the final whistle and in particular the league table, with his side only two places off the top six.
"Basically you have to take on board what Doncaster have done to get into the play-offs, they've been brilliant.
"You expect your strikers to be big and powerful, look at Marquis, our lads need to look up to that as a benchmark for this division to get into that top six.
"We're only two places away from it but miles away in terms of points, not performances, I think the performance today was pretty good and I don't believe we deserved to lose two to nil.
Finally, City's boss said:
"Overall it has been a really good season and we've got to get on with it and build for next season."