Spireites manager Paul Cook gave his reaction following the 1-0 home defeat to MK Dons in Sky Bet League 1.
Visiting striker Benik Afobe scored the game's only goal just after half time, with the hosts unable to break past a professional Dons backline, despite their best efforts.
The loss is the Spireites' first home league defeat since last October, but the Chesterfield manager thought the result could have been different had his side taken advantage of their chances.
He said “We had a great spell in the first half. We did not start the game well, we were poor early on and they looked a threat. We settled into the game and I thought we were terrific for about 25 minutes, but you have got to score when you are on top. Eoin had the chance just after half time, and unfortunately they had that quality with Afobe, which was a great goal."
Despite the defeat, Cook felt that the match would act as a lesson learned from an established League 1 side.
The manager said: “When you come under pressure you have to be brave and bright with what you do, you have to move it better. Unfortunately we never did that, but there was a lesson there today against a very good MK Dons side. We huffed and puffed after that without any real quality and that is what I have said to the lads. They have very good players, and it was a good win for them tonight."
Following a bright start to the season, Cook is sure his players will be able to pick themselves up again.
He said: “We just have to regroup and refocus. We do not get carried away when we win, so we will not get low when we lose. With the level of wanting to win every week for all to see, there is a natural disappointment when you do not achieve your targets."