Zaha has been heavily linked with an Old Trafford move and it appears he is poised to take the next step towards joining the Premier League giants.
Speculation suggests United have agreed a deal worth £15million for the talented youngster, who has also been linked with Arsenal and Tottenham.
The 20-year-old is understood to be heading for a medical at United before the end of the week, which could pave the way for his big-money move.
Reports claim the once-capped England international will sign a five-and-a-half year deal and will be loaned back to Palace for the remainder of the season.
Ian Holloway's side are keen to keep their prized asset as they push for promotion to the Premier League for the first time in eight years.