Barcelona manager Xavi has warned his team that they must be at their best if they are to knock Manchester United out of the Europa League. United are next in action when they travel to face the La Liga giants in the first leg of their play-off tie this week, with a place in the knockout stage proper up for grabs.
Whichever team comes through the two-legged encounter will be one of the favourites to go on and win the competition, as both sides look to add another European trophy to their collection.
United head into the match in fine form after their impressive 2-0 win at Leeds on Sunday, while Barcelona warmed up for the clash with a 1-0 win at Villarreal on the same day.
