The chances are Barça will control the ball and have high possession. If they have an off game like v Malaga for instance, they'll make sloppy passes, losing possession and get hit on the counter attack. Long balls have proven lethal to our defense. If you were watching the game v Levante & Malaga notice Bravo was quite high up the pitch. He was almost trying to play like Stegen & Neuer. Against Levante he was in quite a stupid position but did manage to recover. Against Malaga he bottled it and we all know that lead to Alves ultimately f'n up.
That worries me in the defence if they let the long ball get hoofed up on the break, Citeh do have the speed in their forwards to cause damage. Like wise they also have the height in set pieces but also Stegen in a 1v1 situation... or heck if they even get it up our end and press us, play us at our own game and they manage to get the shot off... I dread to think. If we control the game they must certainly will make mistakes. They may get frustrated and get too aggressive which will lead to fouls, unless they learn from last season and back off a bit.
It'll be an interesting one for sure how this is going to pan out.