Zaha faces Watford at Wembley today in the Premier League promotion playoff.
Hilaire â€” who played 293 times for Palace between 1977-84 â€” says the whizkid can become an Old Trafford regular by helping the Londoners to promotion.
Hilaire, 53, told The Sun: â€śWith a new manager coming in at United, Zaha has the chance against Watford to fire himself into the reckoning at Old Trafford.
â€śIf Zaha puts on a decent performance at Wembley, he could end up starting next season in David Moyesâ€™ first team.
â€śThere is no bigger incentive than that and I expect him to be right on the ball.â€ť
Hilaire reckons Zaha could go on to become a global superstar at United.
He said: â€śI compare him to Cristiano Ronaldo â€” heâ€™s got very quick feet and an eye for goal.
â€śI just hope he gets the chance at United to show what he can do.â€ť