Arsenal take on Barcelona in the Camp Nou on Tuesday with a slender 2-1 lead looking to secure a place in the quarter-finals of the UEFA Champions League. Arsene Wenger's side showed at the Emirates they're good enough to get a result against the competition's favourites but will not for a single second take a trip to Camp Nou lightly. Here, skysports.com takes a look at some of the key showdowns that could determine the tie's outcome
the midfield are going to play a key part in this game
the midfield is going to play a key part in this game