Richard Money has called for the Cambridge Untied crowd to savour every moment when Manchester United come to town on Friday night.
The eleven-time FA Cup winners travel to the Abbey Stadium in The FA Cup Fourth Round Proper, and Cambridge boss Money says it is important everybody shows the belief that they can make the impossible possible.
"I hope they come to the game full of optimism," he said.
Cambridge United v Manchester United
The FA Cup
Fourth Round Proper
7.55pm, Friday 23 January
Live on BBC One
Winners receive £90,000 from prize fund
"I hope they come to the game with some belief that Friday can be the one in one-hundred days that we can cause an upset.
"We want everyone to embrace the evening and an opportunity to showcase not just the football club, but the city."
League Two outfit Cambridge are the lowest ranked team still in this season's Cup, and sit 76 places behind their illustrious visitors.
However, they remain unbeaten so far in 2015 and Money’s men will go into the game full of confidence after dispatching Newport County 4-0 in their last outing.
The Abbey Stadium has a capacity of just under 8,000
And Money says his side can only concentrate on getting their own performance right, before worrying about the superstar names in the opposition line-up.
"I don't think you can think too much about who the individuals are going to be, because they have a plethora of incredible talent, any of whom could play this Friday," he added.
"The only thing you can plan for is how you think they're going to play and that's what we'll be focusing on, and, in the main, focusing on what we can do."
A packed press room at the Cambridge United media day as FA Cup fever engulfs the city
Cambridge have big-match experience within the past 12 months, having twice won at Wembley in The FA Trophy and a Conference play-off final which secured their return to the Football League following a nine-year absence.
The two sides have met twice previously, in a two-legged League Cup tie in 1991. The Us drew the home leg, before going down 3-0 in the reverse fixture at Old Trafford.
