When it comes to selling players to Real, however, it’s been a different story.
David Beckham jumped ship back in 2003, choosing a move to the Bernabeu instead of Barcelona after Ferguson made it clear he would be allowed to leave.
Ruud van Nistelrooy and Gabriel Heinze then followed four years later, going on to win the La Liga title.
And Ronaldo himself swapped Manchester for Madrid in the summer transfer window of 2009, going on to scoop four Champions League titles during a glittering nine-year stint.
Speaking recently, United legend Wes Brown insisted the club needed just three signings to close the gap on Manchester City in the race for the Premier League title.
“I’ve definitely seen an improvement at Manchester United in the past 12 months or so,” he said.