Biggest thing in this game will be to start quick and fast and by this I mean pressuring high up with intensity and purpose from the 1st minute and once the ball is won to hit them on the break with quick passing, not letting them settle and have time on the ball at all. The smaller size of their pitch will suit that kind of game as you can close space quicker. If that doesn't happen and the players start like they did against lpool or crystal palace, those early chances that the other two missed will be converted by chelsea.
They will be the biggest challengers for the league this season and this game will show pep a lot about the team/players and what the season ahead holds for them even at this early stage. Anyone who thinks they have only 2/3 dangerous players is very naive, moses and alonso are as good attacking wing-backs as you'll get and the likes of willian/pedro are very underrated players who can hurt you in a blink of an eye with how intelligent and technical they are on/off the ball.
For the team, the keeper, back 4 and midfield picks itself, its who will be the three out of sterling, sane, aguero and jesus that will be hard to decide and honestly a very good case can be made for all 4. Jesus is the hardest working of them off the ball in pressing and closing space which would suit the game the best and can see pep starting him for that as well as his obvious quality, sterling being the one with the best movement with getting into dangerous goal-scoring situations the most as well as space in behind to stretch them, sane being the one with imo the best ability on the ball and the likeliest to create a chance out of nowhere against a disciplined team like chelsea through his dribbling ability alone and then last but not least aguero being the one world class finisher in the whole team whom you'd want a chance to fall to before all the others. They all offer something different but equally as vital for the team so I don't envy pep deciding who gets left out especially as they are all on such good form.
