Manchester United, Crystal Palace and Wilfried Zaha have reached an agreement for the player to join Manchester United in July 2013.
The player is having a medical in Manchester today (Friday 25 January).
There will be no further comment by any party until Wilfried joins United in July 2013, although Sir Alex did speak briefly about the deal at his Friday morning press-conference.
"As we like to do, we sign young players with potential," the manager said.
"We can also develop players well here. That’s proved to be the case many times.
"Hopefully the boy will enjoy it coming here when he eventually does join us in the summer."