Manchester United will be due a windfall if Crystal Palace sell Wilfried Zaha.

The Daily Star says United inserted a sell-on clause in the deal which saw Zaha return to Palace in 2015.

The precise details of the agreement have remained private between the two clubs but it's understood United would also have a buy-back option if Palace wanted to sell Zaha.

The player, who switched his international allegiance from England to Ivory Coast, has been in exciting form this season and impressed again in the 3-2 defeat to Arsenal on Thursday night.

He is under contract to 2022 so Palace could demand a huge fee if the likes of Arsenal or Chelsea came calling.