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Manchester United meet with old foes Barcelona for the first time since the 2011 UEFA Champions League final on Wednesday night, at the quarter-final stage of this year's competition.

What was the key to defeat on that night?

United won't want to remember that May evening at Wembley but the reason they were defeated eight years ago holds the key to how they can avoid lightning striking twice this time around.

On that night a much younger Lionel Messi absolutely ripped apart Sir Alex Ferguson's men, like he had done in the same final two years earlier.

The Argentine may have only come away from the huge match with one goal to show for his efforts in a 3-1 win, but everyone knew he had pulled the strings of the whole Barca team throughout.

Nearly a decade later and not much has changed in the Catalan capital as the man considered by many to be the greatest footballer of all time is still doing it week-in-week-out at the Camp Nou.

So, similar to how he had been in 2011, Messi is the one the Red Devils have to stop and if they can they will severely cripple their opponent's capabilities. Though there's one obstacle, how that's much easier said than done.

Learning and stopping Ernesto Valverde's men

Man United may not have been able to stop Messi's Barca freight train eight years ago, but they can now if they learn lessons from Ferguson's failure and taking another step towards lifting the famous trophy for the fourth time.

In the 2011 final, the Manchester side failed to recognise the importance of going back to the basics of man-marking to drown "The Magician" out from the defence, lining up with a back four.

The United of today have it in their power to switch to a formation of three centre-backs within a back-five without disturbing any defensive harmony.

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If United single out Messi, of course Barca do have other key players, they can keep a lid on him with a trio of centre-backs and worry about the others after.

He creates as well as scoring goals with most of Valverde's men's play often flowing through the Argentina legend, so if Solskjaer fields Chris Smalling, Victor Lindelof and Phil Jones in defence together he can severely weaken Barcelona's supply line.