The Eagles' boss admits losing the Manchester United-bound winger will be akin to losing a family member, though he backs him to repay the club in Monday's play-off final
Zaha joins Manchester United after the play-off final against Watford on Monday following an impressive season where he has netted eight goals and received his first cap for England.
And Holloway is confident that the 20-year-old can provide his team with the spark they need against the Hornets, and also predicts great things for Zaha at the Red Devils.
"It would be a nice fairy story," he told Sky Sports.
"Wilf will help Manchester United win games. I've never heard anyone talk about one player so much. He just needs to be left alone to play because his talent is so fresh and real and exciting.
"He might do enough right to get us what we need and that would be wonderful. We feel like we are losing a family member."
Zaha netted two vital goals for the Eagles in their 2-0 semi-final win against Brighton and Holloway is adamant that, had they not allowed him the opportunity to move to Manchester United, they would not have reaped the same rewards from his play.
"How would he have been feeling if we'd been selfish and denied him that opportunity? What would he have produced for us after that?," he continued.
"I think he will pay us back. We need him to play well because he's a huge part of what we do."