The Manchester United manager was scouting Los Blancos ahead of his sides Champions League round of 16 second leg meeting with Jose Mourinho's men next Tuesday, and the Scot must have been impressed with the way the La Liga champions saw off their arch rivals.
A Cristiano Ronaldo brace and another from Raphael Varane led Madrid to a 3-1 win on Catalan turf––earning them a spot in the Copa del Rey final.
Madrid went into the game trailing on away goals following a 1-1 draw at the Santiagoe Bernabeu three weeks ago, and the situation will be identical when Mourinho leads his side to Manchester next week.
So what will Ferguson have learnt from Madrid's menacing display and how can the he avoid the traps Barca assistant coach Jordi Roura fell into?
I take a look at five things Ferguson should have heeded from Real Madrid's blitz of Barcelona