The view from Spain

Barcelona must not be overconfident like they were against Chelsea four years ago when they lost the second leg 4-2 after winning the first match 2-1. I don't think it will happen because Pep Guardiola is a very smart manager and will keep his players focused.

Barcelona will probably attack from the start as usual but they must ensure they are not careless at the back. They mustn't concede too many free-kicks or corners and the two centre-backs will need to concentrate. With Rafael Marquez and Carles Puyol missing, I expect Martin Caceres to play alongside Gerard Pique at centre-half rather than Eric Abidal moving from left back or Yaya Toure from central midfield.

Barcelona are playing the best football I have seen and I can't see them not scoring. I'm expecting a match full of goals but the most crucial thing will be who scores first. If Chelsea do, it will be very difficult for
Barcelona but then everyone should remember what happened against Liverpool in the last round when Chelsea were leading 3-1 from the first leg.

Chelsea conceded four against Liverpool and they also let in three against Bolton recently, which suggests that they're not that strong at the back if they try to go forward.

A lot has been said about how strong their defence is but it is easier to defend if you have 10 players behind the ball and the priority is to stop the other team from scoring.

The midfield of Barcelona is the key. Their three attacking players are fantastic and they look so good because of the passes Xavi and Andres Iniesta are providing and the holding job Toure is doing.