Probably looking at facing a 4-2-3-1 again albeit a much more dynamic one than Sunderland provided. Arnautovic and Shaqiri get very far forward and while they're not the highest workrate players ever they do often get back. Will be an important match for us to catch them when they've committed too far forward and punish them for leaving the space. I think our struggles with them last year were related to not having a ton of position discipline leaving us unable to hurt them when they overcommitted in attack. I think this will be a really good test for this system but expect we will get to play with more space than we've operated in thus far in any match bar the end of the Steaua match where they had gotten really worn out by our system. Annoying that weather may be a factor as I'd really like to see us have a go at this one, should be a really interesting test of our tactics. I'm really interested to see what changes, if any, Pep makes to account for the opponent's strengths. He surely knows Shaqiri well enough and Arnautovic has been such a pain in our ass the last few seasons. I'll be particularly interested in how he addresses those two players.