Byron Harrison stepped in as a late replacement in Tuesday's victory over Bradford City, and scored the vital winner in the 1-0 success.
With fellow striker Armand Gnanduillet being pulled from the starting line-up with a late injury, Harrison unexpectedly started and repaid the manager's faith with a calmly taken 45th-minute winner.
Harrison explained his surprise at getting the late call from his manager: "It's funny how football can work, I was told at the last minute that I was starting, so I needed to take my chance.
"We came in from the warm up and the gaffer just said I was in and he didn't say much more than that. That's all I needed to hear, so I grabbed my shirt and came out to play.
"There were a few mental adjustments to make, I've not been around recently but this is what I'm paid to do so I had to go out and do it. I've had good support from the squad so it's easy when they've been so helpful."
Scoring his first Spireites goal, Harrison talked through his effort, which came after anticipating that centre back Gary MacKenzie would under-hit a defensive header.
He said: "I actually heard the other centre half give a shot to go back to his 'keeper so I just made the gamble and luckily it paid off. I know you've still got to stick them away but it was a nice feeling."
The game took place on the Bantams' infamously bumpy pitch, sucking the energy out of Harrison's legs on his first match since missing a fortnight due to a family bereavement.
"The pitch was very soft," said Harrison. "I started to cramp up around five minutes before I came off, the gaffer's seen that and brought on Mani [Dieseruvwe] and he's picked up where I left off.
"It was a real collective effort, we're pleased as a squad but we've got another two games so we're focused and not getting too carried away with this one.
"I dedicated that goal to my nephew. I've been feeling a lot of things recently, even after the goal feeling a lot of stuff, I can't really explain it but it's still a nice feeling to score."