The Spireites' youth team lost 1-0 to Leicester City in the FA Youth Cup fourth round on Monday, and midfielder Mason Coy felt his team could have done better.
Keenan King scored the game's decisive goal in the first half, and it was a weak first half showing from Chesterfield at the King Power Stadium that gave them ultimately too much to do to recover in the tie after the break.
"It was better in the second half," said Coy. "But I feel that if we'd have started like that we'd have had a better chance in the game, so that's disappointing really.
"I thought the warm up had been quiet sharp, but the lads just came out and weren't performing. They came straight on top of us and we just couldn't deal with it at first."
Coy went through what manager Mark Smith had said at half time to try and turn things around in the second period.
"He said to liven up," revealed Coy. "He said we started poorly but we all know we're better than that, we've proved that, so we just needed to get at them a bit more and do what we're good at doing.
"We did that in the second half and we proved that we could give them a game, so we're just disappointed overall."
The second year players will now all be focused on earning professional contracts at the club, and Coy explained how that needs to be put to one side during a match.
He said: "When you're on the pitch that goes to the back of your mind and you don't really think about it, you think about winning the game.
"When you're off the pitch, you're always thinking about it and it's in the back of your head as it's a big part in your life, but when you're on the pitch you just think about winning."