Newcastle completed the signing of the Sweden international on Friday night with the winger arriving at St James’ Park in a deal worth £52million with a further £3million in add-ons.

United never officially disclosed the specifics of the sell-on clause, but sources have confirmed it to be worth 15 percent of any profit made. That means United will take 15 percent of the remaining £37m fee when you subtract the £15m they spent on him two years ago.