“The previous tie between these two sides was a classic. One of the best games of last year, it was fascinating technically, aesthetically and tactically – this meeting offers Arsenal a chance to demonstrate that they’ve learned their lessons from the 6-3 aggregate defeat. There will be significant personnel changes from last year – injury and suspension meant that neither side played anything like their first-choice XI in the second leg, when Lionel Messi ran riot with one of his finest performances in a Barcelona shirt. Robin van Persie, Jack Wilshere, David Villa and Andres Iniesta didn’t play a part in last year’s tie but all will be key here, whilst four of Arsenal’s back five will be different from the game at the Emirates.” Zonal Marking