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Eusebio Di Francesco's side are attempting to overcome a three-goal deficit when the two sides meet at the Stadio Olimpic.
Monchi insists the task is achievable - but believes everyone needs to be behind the lads if Roma are to make history.
"I’d like Rome to be decked out in yellow and red, and for all the fans to hang banners on their balconies to show the world that Rome supports Roma," Monchi told Il Romanista.
"There’s a lot of talk about violence right now, so let’s show everyone that Roma fans are not violent."
He added: "It is the time to be united. Beating Liverpool will be harder than beating Barcelona. There is no tomorrow, everything finishes on Wednesday, and we must make sure we leave everything out on the pitch.
"Every grandfather, grandson, father, mother: on Wednesday we are playing for everyone. I was lucky enough to win a lot at Sevilla, but I never realised my dream of reaching the Champions League final.
"Everyone needs to do what they have to do. Alisson makes a save, Dzeko scores a goal, Daniele [De Rossi] with a pass, the other guys not playing showing their full support for the guys on the pitch. And we have to be absolutely convinced we can do it, because then it is easy to go out and do it."
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