Palace go into the showpiece event at Wembley as underdogs and hoping to win the first major trophy in the club's history.
Palace have endured a difficult 2016 after a fine start to the season but had improved of late until a 4-1 hammering by Southampton on the final day.
With little except pride to play for in the league, Alan Pardew rested players for that game with the cup final in mind.
'It's been phenomenal'
"I think they'll rise to the occasion I really do," Holloway told talkSPORT.
"It's been phenomenal what they've managed to do. I've been a small part of it, and I'm very proud of that, now Alan's taken it on, Tony (Pulis) took it on.
"If Man United play this slow game and then they give it away, that's what Palace is all about, their counter attacking skills that they have is quite sensational."
Palace have had to work hard to make the final beating Southampton away 2-1, Stoke 1-0 at home, seeing off Spurs at White Hart Lane, overcoming Reading 2-0 away and then securing a 2-1 win over Watford in the semi-final.
As every Eagles fan knows, their cup form has been in sharp contrast to that in the league with just two league wins in 2016.
A win would not only secure the club's first major trophy, but also Europa League football at Selhurst Park next season, denying West Ham in the process.