The National League North side claimed their latest scalp in this season’s dramatic competition, having already beaten League One teams Wigan and Peterbrough.
Covid-stricken Championship outfit Derby had to play their Under-23s and Under-18s, with Wayne Rooney and Co unable to travel to Victory Park.
And Chorley took full advantage of their opportunity winning 2-0 in the Saturday lunchtime showdown.
The players and staff relished the occasion and celebrated by bellowing out Adele in the changing room after the match.
Someone Like You was sung at the top of everyone’s lungs, with the video shared on their Twitter page, showing the true magic of the FA Cup in these dark times.
On the win over Derby, goalscorer Mike Calveley said: “We knew we could dominate them because they will never have played as physically strong a side as us.
“They started well but we soon got into the game. And I got my goal and assist. I don’t know what my goal came off but I will take it.
“We are all absolutely buzzing. We could never have thought that this club would get to the fourth round of the FA Cup. It’s amazing, unbelievable.
“It’s a shame we can’t properly celebrate. Can’t wait for the draw now. We would love anyone from the Big Six - away from home, preferably.”
Connor Hall, scorer of Chorley’s first, said: “It is an unbelievable feeling. It is fantastic for the club, that will keep them going for a while. So happy.
"We knew they were not going to be a pushover. We started well and got the early goal but we had to keep pushing because 1-0 is a dangerous scoreline but when the second goal went in it was unbelievable.
"I obviously want to draw one of the biggest teams in England - Newcastle. I am a Newcastle fan!"
Chorley guaranteed themselves a whopping £500,000 payday by clinching a spot in Monday’s fourth and fifth-round draws.
“For a team that was bottom of the National League after four games with zero points to be in the fourth round of the FA Cup is unreal,” said manager Jamie Vermiglio, a primary school headteacher.
“We’ve made around £250,000 before today, goodness knows what it will be now.
“It’ll certainly be £300,000 or £400,000 - we could possibly get to half a million now and for a club like us, not only does it save us, it enables us to grow.”
The Chorley boss cheekily added on his own hopes for the fourth round draw: “If you can organise it, I’d like Liverpool away.”